This can be caused by several things such as incorrect profile, task, or account importing.
In order to fix this issue, go to the Analytics tab and click RESET ALL DATA. This will clear out your tasks, profiles, accounts, webhooks, and proxies. If you'd like to back them up, you can backup ONLY the files that didn't corrupt the bot. For example, if you get the error on the tasks page, only backup the accounts and profiles.