An error occurred in the ‘FirstQual’ query. Expression.Error

[BennyA]

I keep getting an error when I try to run the following code in power query: 

The error I am getting is:

An error occurred in the ‘FirstQual’ query. Expression.Error: 8 arguments were passed to a function which expects between 2 and 3.
Details:
Pattern=
Arguments=[List]

Can someone help?

= () => let
Source = TTQ,
#"ChangedType" =
Table.TransformColumnTypes(Source, {{"EDIPI", Int64.Type}, "TMS", type text}, {"RatingAtCI", type text}, {"PGatCI", type text},
{"AMEXatCI", type text}, {"QualType", type text}, {"QualDate", type text}, {"TTQ_Months", Int64.Type}),
#"Sorted Rows" =
Table.Sort(#"ChangedType", {{"EDIPI", Order.Ascending}, {"TMS", Order.Ascending}, {"QualType", Order.Ascending}, {"QualDate", Order.Ascending}}),
#"Grouped Rows" =
Table.Group(#"Sorted Rows", {"EDIPI", "TMS", "QualType"}, {{"FirstQualDate", each List.Min{[QualDate]},
type date}}),
#"Merged Queries" =
Table.NestedJoin(#"Sorted Rows", #"Grouped Rows", {"EDIPI", "TMS", "QualType", "QualDate"}, {"EDIPI", "TMS", "QualType", "FirstQualDate"},
({"FirstQualType"}),JoinKind.LeftOuter),
#"Removed Columns" =
Table.RemoveColumns(#"Merged Queries", {"FirstQualDate"}),
#"SortedRows1" =
Table.Sort(#"Removed Columns", {{"EDIPI", Order.Ascending}, {"TMS", Order.Ascending},
{"QualType", Order.Ascending}, {"QualDate", Order.Ascending}})

in
#"SortedRows1"

[Anonymous]

Hi @BennyA ,

The error you are getting is because you have passed too many arguments to the Table.TransformColumnTypes function. This function only accepts two or three arguments: a table, a list of column names and types, and optionally a culture value. You have passed eight arguments, which is invalid.

To fix the error, you need to change the second line of your code to something like this:

#"ChangedType" = Table.TransformColumnTypes(Source, {{"EDIPI", Int64.Type}, {"TMS", type text}, {"RatingAtCI", type text}, {"PGatCI", type text}, {"AMEXatCI", type text}, {"QualType", type text}, {"QualDate", type date}, {"TTQ_Months", Int64.Type}}),

Notice that I have changed the type of QualDate column from text to date, since you are using List.Min function on it later. Also, I have removed the extra commas and brackets that were causing syntax errors.

Best Regards,

Neeko Tang

If this post  helps, then please consider Accept it as the solution  to help the other members find it more quickly. 

[BennyA]

Neeko

Thank you for taking the time to respond. I made the changes you suggested and I am now getting the following error:

An error occurred in the ‘MinQualDate’ query. Expression.Error: We cannot convert a value of type List to type Text.
Details:
Value=[List]
Type=[Type]

Here is the modified code with your changes.  I hope you can spot what I have done wrong.

= () => let
Source = TTQ,
#"ChangedType" =
Table.TransformColumnTypes(Source, {{"EDIPI", Int64.Type}, {"TMS", type text}, {"RatingAtCI", type text},
{"PGatCI", type text}, {"AMEXatCI", type text}, {"QualType", type text}, {"QualDate", type date},
{"TTQ_Months", Int64.Type}}),
#"SortedRows" =
Table.Sort(#"ChangedType", {{"EDIPI", Order.Ascending}, {"TMS", Order.Ascending},
{"QualType", Order.Ascending}, {"QualDate", Order.Ascending}}),
#"GroupedRows" =
Table.Group(#"SortedRows", {"EDIPI", "TMS", "QualType"}, {{"FirstQualDate", each
List.Min{[QualDate]}, type date}}),
#"MergedQueries" =
Table.NestedJoin(#"SortedRows", "GroupedRows", {"EDIPI", "TMS", "QualType", "QualDate"}, {"EDIPI",
"TMS", "QualType", "FirstQualDate"}, ({"FirstQualType"}), JoinKind.LeftOuter),
#"RemovedColumns" =
Table.RemoveColumns(#"MergedQueries", {"FirstQualDate"}),
#"SortedRows1" =
Table.Sort(#"RemovedColumns", {{"EDIPI", Order.Ascending}, {"TMS", Order.Ascending}, {"QualType",
Order.Ascending}, {"QualDate", Order.Ascending}})
in
SortedRows1