Unexpected behaviour in Power Query

[RZ]

Hello,

I have a Power BI report that connects to variouys data sources (files, API)  and brings them together. I made some changes yesterday, And I started getting dataformat.error's during refresh. The error is not  associated with one row. Instead the whole step fails. After some backward steps to identify the issue , now I am at a stage where I am getting the error

DataFormat.Error: We couldn't convert to Number.
Details:
    True

at the sorting step where I was hoping to find some problematic data... 

The immediate step before refreshes fine. It s the step where I converted the values to text in order to debug if something was wrong with the data I have,,,

Any suggestions? 

Thanks...

Ruchan 

[RZ]

Well it turned out to be one of the export files had missing columns, so some columns had mismatching type of data which was failing a group by step. I am not sure that expains Power BI behaviour though...

[RZ]

I will now start to remove data sources one by one and see what happens. I  was expecting a magic solution like "OK the cached data must have been corrupt..   Click ctrl-alt-shift refresh and see if that solves it..."  

[lbendlin]

That is indeed weird.  Can you provide sample data in usable format (not as a screenshot) ?