OCI-01435
user does not exist
Cause
This message is caused by any reference to a non-existent user. For example, it occurs if a SELECT, GRANT, or REVOKE statement specifies a username that did not exist. Only a GRANT CONNECT statement may specify a new username. All other GRANT and REVOKE statements must specify existing usernames. If specified in a SELECT statement, usernames must already exist.
Action
Specify only existing usernames in the SELECT, GRANT, or REVOKE statement or ask the database administrator to define the new username.