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Problem creating new CRF

I'm trying to create a CRF as described here, which works so far fine. When I try to create a new CRF in OpenClinica I get the following messages:

"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. ".

There is nothing displayed in the Manage Case Report Forms. Do you have any clue what is going wrong?


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