SafariBookmarksSyncAgent web bookmarks database problem

I cannot sync my bookmarks from iCloud to Safari on a macbook pro. Console message is:

com.apple.SafariShared:

Failed to decode customization sync server change token: Error Domain=NSCocoaErrorDomain Code=4864 "The data couldn’t be read because it isn’t in the correct format."

com.apple.defaults:

rejecting read of { com.apple.CloudKit, foo, kCFPreferencesAnyHost, /Users/foo/Library/Preferences/com.apple.CloudKit.plist, managed: 0 } from process 1089 (SafariBookmarksSyncAgent) because accessing these preferences requires user-preference-read or file-read-data sandbox access

SafariBookmarksSyncAgent:

Couldn't read values in CFPrefsPlistSource<0x7fd2d1f3d490> (Domain: com.apple.CloudKit, User: kCFPreferencesCurrentUser, ByHost: No, Container: (null), Contents Need Refresh: Yes): accessing these preferences requires user-preference-read or file-read-data sandbox access

com.apple.WebBookmarks:

Warning: The web bookmarks database has a greater version number than expected. Restoring a database from a newer version is not supported.

Is there any way to restore the bookmarks or modify the web bookmarks database?