Errors and warnings

• Cannot add folder. It contains a folder that is already syncing.
• Core warnings
• Database error
• "Excessive time difference" error
• Service files missing / Cannot identify destination folder
• SE_SM_NO_IDENTITY
• Error 205
• Cannot connect to trackers
• Selected folder is already added to Sync
• Can't read a QR code
• Folder not empty
• Folder not found