Can't edit my rosters

[Michael Doiu - Peel Virtual Elementary School (1831)]

Hi there. I can't update any of my class rosters. It keeps giving me the following message. I have tried uninstalling and reinstalling, but that didn't work.

Any ideas?

Caught something:
property: message
value: [No item with the given ID could be found. Possibly because you have not edited this item or you do not have permission to access it.]
property: name
value: [Exception]
property: fileName
value: [step2Ui (Doctopus)]
property: lineNumber
value: [535]
property: stack
value: [ at step2Ui (Doctopus):535
at utilities (Doctopus):1964 (call_)
at step2Ui (Doctopus):534 (createStudentFolders)
at step2Ui (Doctopus):928 (updateRoster)
]
toString(): value: [Exception: No item with the given ID could be found. Possibly because you have not edited this item or you do not have permission to access it.]

Caught something:
property: message
value: [Unexpected token: u]
property: name
value: [SyntaxError]
property: fileName
value: [step2Ui (Doctopus)]
property: lineNumber
value: [929]
property: stack
value: [ at step2Ui (Doctopus):929 (updateRoster)
]
toString(): value: [SyntaxError: Unexpected token: u]