"Request timed out" when Synchronization

I want to transfer my library from my Zotero account online to Zotero on my local computer, but cannot synchronize the data as the message "Request timed out" appears. I just recently bought a new PC and i want to have my last library on it, but this failure message is appearing when i try the synchronisation of the online account. Any solution for this problem?
Thank you very much in advance.

Kind regards,
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