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An error occured while attempting to delete this schedule.
Please provide the relevant error logs. This is not enough information to work with.
Errors from Browser Console:

Those logs are fine, shows it鈥檚 probably Auth logic that鈥檚 broken.
In this case (as this is Ajax) those are the first logs you can get. As this is just getting an unauthorized error there probably won't be anything in the panel logs anyways. I told him to upload that screenshot here.
Most helpful comment
In this case (as this is Ajax) those are the first logs you can get. As this is just getting an unauthorized error there probably won't be anything in the panel logs anyways. I told him to upload that screenshot here.