error 003811975 : I can't synce my data on Zotero 5 with my library online bibliotdv

As I wanted to synce my datas on Zotero 5 offline with my library online thanks to the Firefox connector, the syncing failed with this error message "Item collection 306 not found" ID 003811975 : . This has just happened although I have already done syncings on Zotero 5 and that I have never had an error message of this type.
Thank you in advance for your help,
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