Expression Error The column of the table was not found in Dataflow

[smjzahid]

I have a dataflow which has multiple transformation steps, and my one of the steps (shown belwo) named "Invoke Custom Function", now throws an Expression Error, 

I did tried to go through the entire query by copying it from the ADVANCED EDITOR and pasting it in notepad and used the (FIND) functionality of notepad to look for the column named EWR_Planner, but this column does not exist in the entire query. 

How do I get rid of this expression error from my dataflow

[smjzahid]

Hi @SteveCampbell  Thanks for your reply, Yes, I can see one custom function (see below), but I cant see the column thats cause the error, EWR_Planner,

How do I rectify this, Please help

[v-yiruan-msft]

Hi @smjzahid ,

Could you please share the applied codes of the related query in Advanced Editor in order to make troubleshooting? Thank you. In addition, you can review the following similar threads and check whether their solution can also help resolve your problem.

Power BI - "Expression.Error: The column of the table wasn't found

Power Query: Preventing "The column of the table wasn't found" error

Best Regards
Rena
Community Support Team _ Rena Ruan
If this post helps, then please consider Accept it as the solution to help the other members find it more.

[SteveCampbell]

This runs a custom function, which will be another query. If you look for the name of this function in the formula bar / advanced editor, you should see it in the queries on the left.

Here you will find the column throwing the error