Problem while uploading data, process never ends.

Hi, I am trying to import a first file via the UI but the process never ends. I also received the following email but I don't know how it can help as I cannot see the "integration error message"...

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Hello,

This email is sent to inform you that the processing of your data in the Good
Data application encountered some errors. To resolve this issue, please follow
these steps:

1) Return to your data upload page and view the data integration error message
...
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