Indicates that an assessment is unavailable for external management, either
because it is not an external assessment, or it is not known to the gradebook.
indicates that there was an attempt to enter an assignments grade with a zero
point grade allowed but with a grade greater than "0" assigned to it which could results
in a divide by zero calculation.
This is the externally exposed API of the gradebook application.
This interface is principally intended for clients of application services --
that is, clients who want to "act like the Gradebook would" to automate what
would normally be done in the UI, including any authorization checks.
As a result, these methods may throw security exceptions.