Skip to main content
cancel
Showing results for 
Search instead for 
Did you mean: 

Join us for an expert-led overview of the tools and concepts you'll need to become a Certified Power BI Data Analyst and pass exam PL-300. Register now.

Reply
Anonymous
Not applicable

Value cannot be null power bi query

Hi All, Need help

I am running a simple query to extract the data from the rest API based on the date query variable. Below is my query

 

let
dtquery=Text.From(#date(2020,7,7)),
Source=Json.Document(Web.Contents("https://serviceinstance.xxxx.com/api/now/table/incident?&sysparm_display_value=true&sysparm_exclude_...", [Query=[dt=dtquery]]
)),

#"Converted to Table" = Table.FromList(Source, Splitter.SplitByNothing(), null, null, ExtraValues.Error)
in
#"Converted to Table"

 

when trying to run I am getting this error:

 

Unexpected error: Value cannot be null.
Parameter name: str
Details:
Microsoft.Mashup.Evaluator.Interface.ErrorException: Value cannot be null.
Parameter name: str ---> Microsoft.Mashup.Evaluator.Interface.ErrorException: Value cannot be null.
Parameter name: str ---> Microsoft.Mashup.Evaluator.Interface.ErrorException: Value cannot be null.
Parameter name: str ---> Microsoft.Mashup.Evaluator.Interface.ErrorException: Value cannot be null.
Parameter name: str ---> Microsoft.Mashup.Evaluator.Interface.ErrorException: Value cannot be null.
Parameter name: str ---> System.ArgumentNullException: Value cannot be null.
Parameter name: str ---> System.ArgumentNullException: Value cannot be null.
Parameter name: str
at Microsoft.Mashup.Common.UriMethods.EscapeDataString(String str, Boolean legacyBehavior)
at Microsoft.Mashup.Engine1.Library.Uris.UriHelper.BuildQueryString(NameValueCollection queryParameters)
at Microsoft.Mashup.Engine1.Library.Uris.UriHelper.AddQueryRecord(UriBuilder uriBuilder, NameValueCollection newQueryString)
at Microsoft.Mashup.Engine1.Library.Uris.UriHelper.AddQueryRecord(Uri originalUri, NameValueCollection queryParameters)
at Microsoft.Mashup.Engine1.Library.Uris.UriHelper.AddQueryRecord(Uri originalUri, RecordValue newQuery)
at Microsoft.Mashup.Engine1.Library.Web.Request.Create(IEngineHost host, String resourceKind, String resourcePath, TextValue url, Value query, Value content, String webApiKey, Value headers, Value timeout, Int32[] nonErrors, Value relativePath, Value credentialQuery, Action`2 responseErrorHandler)
at Microsoft.Mashup.Engine1.Library.Web.WebOptionsHelper.GetRequest(IEngineHost host, String resourceKind, String resourcePath, TextValue url, Value options, Boolean privilegedMode, Action`2 responseErrorHandler)
at Microsoft.Mashup.Engine1.Library.Web.WebModule.WebContentsFunctionValue.TypedInvoke(TextValue url, Value options)
at Microsoft.Mashup.Engine1.Runtime.NativeFunctionValue2`3.Invoke(Value arg0, Value arg1)
at Microsoft.Mashup.Engine1.Language.DebugInstruction.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.InstructionInvocationInstruction1.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.DebugInstruction.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.FunctionInvocationInstruction2.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.DebugInstruction.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.InstructionInvocationInstruction2.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.DebugInstruction.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.MembersFunctionValue1.Invoke(Value arg0)
at Microsoft.Mashup.Engine1.Language.RecordInstruction.RuntimeRecordValue.Force(Int32 index)
at Microsoft.Mashup.Engine1.Language.RecordInstruction.RuntimeRecordValue.get_Item(Int32 index)
at Microsoft.Mashup.Engine1.Language.Instruction.Execute(MembersFrame1& frame, Instruction[] instructions)
at Microsoft.Mashup.Engine1.Language.InstructionInvocationInstruction.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.DebugInstruction.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.FunctionInvocationInstruction2.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.DebugInstruction.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.InstructionInvocationInstruction2.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.DebugInstruction.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.MembersFunctionValue1.Invoke(Value arg0)
at Microsoft.Mashup.Engine1.Language.RecordInstruction.RuntimeRecordValue.Force(Int32 index)
at Microsoft.Mashup.Engine1.Language.RecordInstruction.RuntimeRecordValue.get_Item(Int32 index)
at Microsoft.Mashup.Engine1.Language.MembersFunctionValue1.Invoke(Value arg0)
at Microsoft.Mashup.Engine1.Language.RecordInstruction.RuntimeRecordValue.Force(Int32 index)
at Microsoft.Mashup.Engine1.Language.RecordInstruction.RuntimeRecordValue.get_Item(Int32 index)
at Microsoft.Mashup.Engine1.Runtime.Library.Linker.BindFunctionValue.TypedInvoke(RecordValue environment, Value section, TextValue name)
at Microsoft.Mashup.Engine1.Runtime.NativeFunctionValue3`4.Invoke(Value arg0, Value arg1, Value arg2)
at Microsoft.Mashup.Engine1.Language.MembersFunctionValue0.Invoke()
at Microsoft.Mashup.Engine1.Language.ListInstruction.RuntimeListValue.Force(Int32 index)
at Microsoft.Mashup.Engine1.Language.ListInstruction.RuntimeListValue.get_Item(Int32 index)
at Microsoft.Mashup.Engine1.Language.MembersFunctionValue1.Invoke(Value arg0)
at Microsoft.Mashup.Engine1.Language.RecordInstruction.RuntimeRecordValue.Force(Int32 index)
at Microsoft.Mashup.Engine1.Language.RecordInstruction.RuntimeRecordValue.get_Item(Int32 index)
at Microsoft.Mashup.Engine1.Language.FunctionInvocationInstruction2.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.Instruction.ExecuteCondition(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.DebugInstruction.ExecuteCondition(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.IfInstruction.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.DebugInstruction.Execute(MembersFrame1& frame)
at Microsoft.Mashup.Engine1.Language.MembersFunctionValue1.Invoke(Value arg0)
at Microsoft.Mashup.Engine1.Language.RecordInstruction.RuntimeRecordValue.Force(Int32 index)
at Microsoft.Mashup.Engine1.Language.RecordInstruction.RuntimeRecordValue.get_Item(Int32 index)
at Microsoft.Mashup.Engine1.Language.MembersFunctionValue0.Invoke()
at Microsoft.Mashup.Evaluator.SimpleDocumentEvaluator.BeginGetResult(DocumentEvaluationParameters parameters, Action`1 callback)
--- End of inner exception stack trace ---
at Microsoft.Mashup.Evaluator.SimpleDocumentEvaluator.BeginGetResult(DocumentEvaluationParameters parameters, Action`1 callback)
at Microsoft.Mashup.Evaluator.SimpleDocumentEvaluator.BeginGetResult(DocumentEvaluationParameters parameters, Action`1 callback)
at Microsoft.Mashup.Evaluator.Interface.IDocumentEvaluatorExtensions.GetResult[T](IDocumentEvaluator`1 evaluator, DocumentEvaluationParameters parameters)
at Microsoft.Mashup.Evaluator.RemoteDocumentEvaluator.Service.OnBeginGetResult[T](IMessageChannel channel, BeginGetResultMessage message, Action`1 action)
at Microsoft.Mashup.Evaluator.RemoteDocumentEvaluator.Service.OnBeginGetPreviewValueSource(IMessageChannel channel, BeginGetPreviewValueSourceMessage message)
at Microsoft.Mashup.Evaluator.MessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.ChannelMessenger.ChannelMessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.MessageHandlers.Dispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.ChannelMessenger.OnMessageWithUnknownChannel(IMessageChannel baseChannel, MessageWithUnknownChannel messageWithUnknownChannel)
at Microsoft.Mashup.Evaluator.MessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.ChannelMessenger.ChannelMessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.MessageHandlers.Dispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.EvaluationHost.Run()
at Microsoft.Mashup.Container.EvaluationContainerMain.Run(Object args)
at Microsoft.Mashup.Evaluator.SafeThread2.<>c__DisplayClass9_0.<CreateAction>b__0(Object o)
at Microsoft.Mashup.Container.EvaluationContainerMain.SafeRun(String[] args)
at Microsoft.Mashup.Container.EvaluationContainerMain.Main(String[] args)
--- End of inner exception stack trace ---
at Microsoft.Mashup.Evaluator.SimpleDocumentEvaluator.<>c__DisplayClass3_0.<BeginGetResult>b__0(EvaluationResult2`1 result)
--- End of inner exception stack trace ---
at Microsoft.Mashup.Evaluator.SimpleDocumentEvaluator.<>c__DisplayClass3_0.<BeginGetResult>b__0(EvaluationResult2`1 result)
at Microsoft.Mashup.Evaluator.SimpleDocumentEvaluator.BeginGetResult(DocumentEvaluationParameters parameters, Action`1 callback)
at Microsoft.Mashup.Evaluator.SimpleDocumentEvaluator.BeginGetResult(DocumentEvaluationParameters parameters, Action`1 callback)
at Microsoft.Mashup.Evaluator.Interface.IDocumentEvaluatorExtensions.GetResult[T](IDocumentEvaluator`1 evaluator, DocumentEvaluationParameters parameters)
at Microsoft.Mashup.Evaluator.RemoteDocumentEvaluator.Service.OnBeginGetResult[T](IMessageChannel channel, BeginGetResultMessage message, Action`1 action)
at Microsoft.Mashup.Evaluator.RemoteDocumentEvaluator.Service.OnBeginGetPreviewValueSource(IMessageChannel channel, BeginGetPreviewValueSourceMessage message)
at Microsoft.Mashup.Evaluator.MessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.ChannelMessenger.ChannelMessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.MessageHandlers.Dispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.ChannelMessenger.OnMessageWithUnknownChannel(IMessageChannel baseChannel, MessageWithUnknownChannel messageWithUnknownChannel)
at Microsoft.Mashup.Evaluator.MessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.ChannelMessenger.ChannelMessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.MessageHandlers.Dispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.EvaluationHost.Run()
at Microsoft.Mashup.Container.EvaluationContainerMain.Run(Object args)
at Microsoft.Mashup.Evaluator.SafeThread2.<>c__DisplayClass9_0.<CreateAction>b__0(Object o)
at Microsoft.Mashup.Container.EvaluationContainerMain.SafeRun(String[] args)
at Microsoft.Mashup.Container.EvaluationContainerMain.Main(String[] args)
--- End of inner exception stack trace ---
at Microsoft.Mashup.Evaluator.RemoteDocumentEvaluator.Service.<>c__DisplayClass9_1.<OnBeginGetPreviewValueSource>b__1()
at Microsoft.Mashup.Evaluator.RemotePreviewValueSource.<>c__DisplayClass0_0.<RunStub>b__0()
at Microsoft.Mashup.Evaluator.EvaluationHost.ReportExceptions(IHostTrace trace, IEngineHost engineHost, IMessageChannel channel, Action action)
--- End of inner exception stack trace ---
at Microsoft.Mashup.Evaluator.EvaluationHost.<>c__DisplayClass11_0.<TryReportException>b__1()
at Microsoft.Mashup.Common.SafeExceptions.IgnoreSafeExceptions(IEngineHost host, IHostTrace trace, Action action)
at Microsoft.Mashup.Evaluator.EvaluationHost.TryReportException(IHostTrace trace, IEngineHost engineHost, IMessageChannel channel, Exception exception)
at Microsoft.Mashup.Evaluator.EvaluationHost.ReportExceptions(IHostTrace trace, IEngineHost engineHost, IMessageChannel channel, Action action)
at Microsoft.Mashup.Evaluator.RemotePreviewValueSource.RunStub(IEngineHost engineHost, IMessageChannel channel, Func`1 getPreviewValueSource)
at Microsoft.Mashup.Evaluator.RemoteDocumentEvaluator.Service.<>c__DisplayClass12_1`1.<OnBeginGetResult>b__0()
at Microsoft.Mashup.Evaluator.EvaluationHost.ReportExceptions(IHostTrace trace, IEngineHost engineHost, IMessageChannel channel, Action action)
at Microsoft.Mashup.Evaluator.RemoteDocumentEvaluator.Service.OnBeginGetResult[T](IMessageChannel channel, BeginGetResultMessage message, Action`1 action)
at Microsoft.Mashup.Evaluator.RemoteDocumentEvaluator.Service.OnBeginGetPreviewValueSource(IMessageChannel channel, BeginGetPreviewValueSourceMessage message)
at Microsoft.Mashup.Evaluator.MessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.ChannelMessenger.ChannelMessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.MessageHandlers.Dispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.ChannelMessenger.OnMessageWithUnknownChannel(IMessageChannel baseChannel, MessageWithUnknownChannel messageWithUnknownChannel)
at Microsoft.Mashup.Evaluator.MessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.ChannelMessenger.ChannelMessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.MessageHandlers.Dispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.EvaluationHost.Run()
at Microsoft.Mashup.Container.EvaluationContainerMain.Run(Object args)
at Microsoft.Mashup.Evaluator.SafeThread2.<>c__DisplayClass9_0.<CreateAction>b__0(Object o)
at Microsoft.Mashup.Container.EvaluationContainerMain.SafeRun(String[] args)
at Microsoft.Mashup.Container.EvaluationContainerMain.Main(String[] args)
--- End of inner exception stack trace ---
at Microsoft.Mashup.Evaluator.EvaluationHost.OnException(IEngineHost engineHost, IMessageChannel channel, ExceptionMessage message)
at Microsoft.Mashup.Evaluator.MessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.MessageHandlers.Dispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.ChannelMessenger.ChannelMessageHandlers.TryDispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.MessageHandlers.Dispatch(IMessageChannel channel, Message message)
at Microsoft.Mashup.Evaluator.Interface.IMessageChannelExtensions.WaitFor[T](IMessageChannel channel)
at Microsoft.Mashup.Evaluator.RemotePreviewValueSource.PreviewValueSource.WaitFor(Func`1 condition, Boolean disposing)
at Microsoft.Mashup.Evaluator.RemotePreviewValueSource.PreviewValueSource.get_TableSource()
at Microsoft.Mashup.Evaluator.Interface.TracingPreviewValueSource.get_TableSource()
at Microsoft.Mashup.Host.Document.Analysis.PackageDocumentAnalysisInfo.PackagePartitionAnalysisInfo.SetPreviewValue(EvaluationResult2`1 result, Func`1 getStaleSince, Func`1 getSampled)

 

6 REPLIES 6
Anonymous
Not applicable

Hi,
I'm experiencing the same error when using 

Json.Document(Web.Contents(https://testrail.io/index.php?/api/v2/get_tests/34&limit=30, [Headers = HeadersRecord, Query=[limit="30"]]))

From what I can see, the error is complaining about the valueless query parameter in the URL after "index.php?/api/...".
Was there a working solution for this?

v-eachen-msft
Community Support
Community Support

Hi @Anonymous ,

 

Here is a detailed blog about Web.Contents() for your reference:

https://blog.crossjoin.co.uk/2016/08/16/using-the-relativepath-and-query-options-with-web-contents-in-power-query-and-power-bi-m-code/

 

Community Support Team _ Eads
If this post helps, then please consider Accept it as the solution to help the other members find it.
Anonymous
Not applicable

I tryed this and there is no error :

 

image.png

 

the problem is somewhere else

 

 

 

Anonymous
Not applicable

 

the main suspect seems to be the second null of this expression:

 

#"Converted to Table" = Table.FromList(Source, Splitter.SplitByNothing(), null, null, ExtraValues.Error)

 

you could try .

 

1)  remove all optional parameters then use  #"Converted to Table" = Table.FromList(Source) and see ...

2) should set the second null to some value.  I dont know the role and the scope of each parameter of this function and the MS docs don't help very much on this aspect, but we (i.e. you) can experiment ...

 

 

@Anonymous's issue must be with:

Web.Contents("https://serviceinstance.xxxx.com/api/now/table/incident?&sysparm_display_value=true&sysparm_exclude_...", [Query=[dt=dtquery]])

when it actually runs, it probably gets transformed to:

Web.Contents("https://serviceinstance.xxxx.com/api/now/table/incident?&dt=dtquery")

try adding all queries in the [Query=[]] record




Spyros Mavroforos

Data Consultant


Find me on LinkedIn or drop me an email

eSpyros

Anonymous
Not applicable

@Smauro Thanks for the reply.

I have a query parameter in my rest API which filters data based on date which is like "sysparm_query=sys_created_on>%3Djavascript%3Ags.dateGenerate(%272020-07-07%27%2C%2700%3A00%3A00%27)"

as you can see its uses a java script for date format and also formats the operators like greater than or equal to for processing.

 

how can i pass this value in my web content as parameter?

 

Helpful resources

Announcements
Join our Fabric User Panel

Join our Fabric User Panel

This is your chance to engage directly with the engineering team behind Fabric and Power BI. Share your experiences and shape the future.

June 2025 Power BI Update Carousel

Power BI Monthly Update - June 2025

Check out the June 2025 Power BI update to learn about new features.

June 2025 community update carousel

Fabric Community Update - June 2025

Find out what's new and trending in the Fabric community.