Note: This was originally posted by an inactive account. Content was preserved by moving under an admin account.
Originally posted by: Tim MeagherThis is generally just a warning and not an error.
The warning will be written to the log when trying to read an Excel File where the file does not match it's expected format.
If the file has a .xls extension, it will first try and read the file as if it where a XLS format file, if this fails you will get the error message above.
Then, it will proceed trying to read it as an XLSX format file.
If both of these fail, then you will receive an error.
Similarly, for a .xlsx extension it will first try and read as an XLSX format, then an XLS format if the first attempt fails.
Again if both fail, you will receive an error on the node.
The reasons that this could fail could be numerous.
It could just be a non-Excel file, like a file in a CSV format or text format or something.
Alternately, it could be a file that was not created through Excel but in a 3rd party product.
While the node should work with any XLS or XLSX format saved through Excel or saved via any 3rd party product that follows these format specifications, there may be other tools which produce XLS/XLSX files which do not exactly match the format dictated by Excel. In such cases, you
may be able to open the file in Excel (if Excel is lenient about its format) but may not be able to load into the LAE.
First, you should probably check that the file can actually be opened in Excel.
If it can, then you should try to save a copy from Excel to another XLS/XLSX file.
If you can load this copy of the file, without a problem then it would suggest that the original file was not produced by Excel but by another 3rd party tool which is not producing files in the same format that Excel does.