problem uploading new CRF

When i want to upload a new CRF and i click preview CRF version i get next message:

"The application encountered a problem uploading the Excel template and creating a preview CRF

Congratulations! Your spreadsheet generated no errors.
Please review it.
You can save it to database by clicking "Continue".

The Preview data has timed out and expired. You can start the CRF version creation process again."

Does anyone knows what to do now?

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