Sync issue 1583158183

I've created a group with sub-collections.
Only the group appears on zotero website, not the subcollections. there seems to be a problem with the syncing process : I have an error icon (a red !) next to the sync icon, saying "Invalid response from server. Please try again in a few minutes" - but it's been the same for a fex hours now...
Any help is welcome !
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