Problem in synchronizing and adding citation

Dear all,
I have two problems with my zotero. One is syncing with zotero.org. The report reads as follows.
An error occurred during syncing:

Error(s) encountered during statement execution: database disk image is malformed [QUERY: SELECT rowid FROM fulltextItems WHERE itemID=? LIMIT 1] [PARAMS: 4029] [ERROR: database disk image is malformed]

And the other seems more serious, I can not add citation under MS-Word. The simple click does not result any response from the Zotero add-on.

Any response will be appreciated!
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