Suddenly "Expression.Error: A cyclic reference was encountered during evaluation."

[PK242]

Since today, I encounter expression errors in a workbook I am working with. It also happens with older versions of the workbook that were fine before.

It happens twice in my query:

Here: 

let
Source = Excel.Workbook(Parameter1, null, true),
Export_Sheet = Source{[Item="Export",Kind="Sheet"]}[Data],
#"Promoted Headers" = Table.PromoteHeaders(Export_Sheet, [PromoteAllScalars=true])
in
#"Promoted Headers"

and in another step here:

let
Source = Excel.Workbook(Parameter2, null, true),
Export_Sheet = Source{[Item="Export",Kind="Sheet"]}[Data],
#"Promoted Headers" = Table.PromoteHeaders(Export_Sheet, [PromoteAllScalars=true])
in
#"Promoted Headers"

I have absolutely no clue why this is happening since today, but hopefully someone can point me in the right direction.

Many thanks in advance!

Phil

[PK242]

Hey Pete, 

thanks a lot for your quick reply, much appreciated!

Turned out that the parameter was indeed the culprit; for reasons unknown to me, there was no current value selected. Once I selected it, the query was fixed.

See here:

BR 

Phil

[BA_Pete]

Cool, glad it's sorted.

As a completely unrelated bonus hack, you can change the second argument in your Excel.Workbook source function to 'true' to avoid having to do the Promote Headers step:

// From this:
Source = Excel.Workbook(Parameter1, null, true),

// To this:
Source = Excel.Workbook(Parameter1, true, true),

I like tidy code! 🙂

Pete

[BA_Pete · Accepted solution]

Hi Phil,

The only place I can see that could create circular references here is your Parameters that you're using to identify the workbooks in the Source steps.

Try and materialise the parameters somewhere, or check in the parameter settings, to see exactly what they are pointing to, or post the parameter details here if you're not sure what you're looking for.

Pete