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I just had this issue myself. We were reading data from Qlik in QVX format. This file has metadata saved for each column.
The issue was that the Qlik file said "Column X" has data type "DOUBLE". But on 5 out of 1 000 000 records, there was a text string insdie the column.
Browsing the file with the browse tool crashed Alteryx and closed it immidiatly. So Alteryx seems to be so stressed out about this that it dies of an immidat heart attack, pannicing as it thinks "I know every number in the whole world, why can't I figure out which number 'ABCD' is?".
So I added a select tool right after the source file, then changed field type to VW_String. This was Alteryx didn't crash and i found the rows in question. Then we had backend fix the issue before the export. It could have been solved by chaning type back to Double again, but then I would get null values.
I am getting this error with a process I've been running for over 2 years now. Nothing has changed in my workflow. I just started getting the error message a couple of weeks ago. I'm actually going to sit and watch it today and see where the error hits. It is a very long, detailed workflow.