This error is reported if you open a test project in Test Designer containing symbols that do not conform with ARIS Method.
Error message
The project uses the user-defined symbol <name of symbol> that is not available for the connected tenant. Please import a filter containing this symbol.
Further information is available on the When are method changes available? help page (Help > Help topics).
Cause
This symbol is available in the test project, but not on the current tenant.
Solution
Import a method filter into the configuration of the current tenant.