If I try to sychronize my library I get the following report:

[extra output removed — D.S.]

[JavaScript Error: "Error: Cannot make changes to library (Report ID: 081b085a)" {file: "chrome://zotero/content/xpcom/sync.js" line: 638}]

[JavaScript Error: "[Exception... "'No parameters provided for query containing placeholders [QUERY: SELECT groupID FROM groups WHERE libraryID=?]' when calling method: [nsITimerCallback::notify]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "native frame :: :: :: line 0" data: no]"]

[JavaScript Error: "Error: Cannot make changes to library (Report ID: 7ce31d29)" {file: "chrome://zotero/content/xpcom/sync.js" line: 638}]

[JavaScript Error: "[Exception... "'No parameters provided for query containing placeholders [QUERY: SELECT groupID FROM groups WHERE libraryID=?]' when calling method: [nsITimerCallback::notify]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "native frame :: :: :: line 0" data: no]"]

[JavaScript Error: "Error: Cannot make changes to library (Report ID: 0f82fb62)" {file: "chrome://zotero/content/xpcom/sync.js" line: 638}]

[JavaScript Error: "[Exception... "'No parameters provided for query containing placeholders [QUERY: SELECT groupID FROM groups WHERE libraryID=?]' when calling method: [nsITimerCallback::notify]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "native frame :: :: :: line 0" data: no]"]"
I'm using Firefox on Ubuntu.
Best
Benoit