TREX is not indexing certain excel files

Hi Experts,

TREX is not indexing certain excel-files correctly. I get a "no message found error" (14047) Trex: Preparation failed: index operation by certain excel files - but not by all. I found out what they have in common: some have filters activated and some have a lot of columns or rows.

Is there any way to avoid these errors and index them correctly?

TREX: 7.0.47

Portal: 7.01 SP7

Thank you in advance

Best Regards

Norman