Error message on importing spreadsheet, undefined array key

Submitted by ClaireSmyth on

I'm trying to upload a spreadsheet of moth sightings.  The validation completes ok but the upload fails with a page of code headed 'Undefined array key 'readAuth' in import_helper_2'  and a mention of line 997 and get global values.  Going back to the page for submitting the file, it now has an error banner saying 'Unexpected error' 'Unsupported operand types: null + array in import_helper_2' at line 998

Is it my file or iRecord? 

Thanks, Claire