-8022: User already connected

Explanation:

A user attempts to connect to the database system under a user name which was defined with EXCLUSIVE in a CREATE USER, CREATE USERGROUP, ALTER USER or ALTER USERGROUP statement. Another user has also connected using this name.

User Response:

Wait until the other user has disconnected from the database system using a RELEASE statement.

To enable a user to have various simultaneous connections, NOT EXCLUSIVE must be specified for this user with the ALTER USER or ALTER USERGROUP statement  These SQL statements may only be executed by the owner of the user or user group.