In case your app was crashed and no longer starts up, you have the option to delete the local content.
Caution! You will lose all data which is not yet send to the cloud. Just do it if you know what you do, else contact the support!
1. Go to the Settings
2. Scroll down to "coresuite"
3. Activate "Delete Companies"
4. Start coresuite, on the top should be the message "Deleted all companies"
5. You can now do an initialsync again