Error while importing SSL-Certificate

Error while importing SSL-Certificate

Hi,
I'm trying to update my Certificate with a new SSL4Free/Let's Encrypt one.
But everytime I try to save the new Certificate I get the Error:
Unknown error occured while processing certificates. Contact support with the certificate and server logs.

The Certificate I'm trying to replace is from the same source (just 3 months older)

I tried both, a wildcard and a dedicated one, but no success (the old one was a wildcard).

What can I do to solve this problem?

Greets
Daniel

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