Oracle Error Codes

GRANT failed: password file 'string' is full

The grant failed when a user could not be added to the password file, because all available slots in it were used already.

How to Solve :

Either create a larger password file or free up slots in the password file by revoking the SYSOPER and SYSDBA privileges from some of the remote users. You can determine which remote users are valid and their privileges by issuing the following query in SQL*DBA:SELECT * FROM V$REMOTE_USERS;