Tried to grant a privilege to an user, but it failed with ORA-01917.
SQL> grant create session to erapp;
grant create session to erapp
ERROR at line 1:
ORA-01917: user or role 'ERAPP' does not exist
ORA-01917 means that the grantee you specified in the statement or during import is neither an user nor a role, you have to use a valid user or role to make it. For data pump, you have to create the user or role before importing.
In this case, we correct the grantee into a valid user like this:
SQL> grant create session to erpapp;
There're more examples to grant privileges correctly, you may have a look.