Hi,
Writing in English is helpful, though it is not necessarily required. Thank you.
The error message you mention is from Anki desktop version, so I guess you want to know the steps on it.
You can do the complete synchronization ("full sync") by the following steps: "Tools" on the menu -> "Preferences" -> "Syncing" -> Enable "On next sync, force changes in one direction" -> "Close" the window -> "Sync" on the main window
Best wishes,
Yuki