"This series no longer exists in this system."
Where: Grade system screen > adding or editing a grade (Series field). Owner only.
Why: the chosen series does not belong to this system, or it was just removed (for example in another tab).
What to do: reload the screen, then choose one of the series shown, or create one with Add a series.
Didn't find your answer?
Write to bonjour@martialnote.com from your account's address, saying which screen is involved and the message shown. Support is by email only, with no guaranteed response time. Never send information about your students.