Hi, @rony94!
The key error here seems to be:
Apr 16 11:05:35 mattermost platform[22673]: [2018/04/16 11:05:35 -03] [CRIT] SqlSystemStore.SaveOrUpdate: We encountered an error saving the system property,
Unfortunately, it seems like it’s truncated. Can you enable logging to a file, and see if there is more context to the error? I would also recommend enabling "FileLevel": "DEBUG" while you’re in there.