sync error

Zotero 5.0.56 was installed in Windows 10 Enterprise.

After sync, there is a red button near the green arrow indicating there is a sync error. Clicking the red button shows:
Zotero-File-Modification-Time header not set in file request for 1/M4WZAB44

The error was reported. report ID:785521456


When I double clicked an attached pdf file, there is an error message:
Zotero-File-Modification-Time header not set in file request for 3/MYVBRSP6

The error was also reported. report ID: 181232645

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