Kaltura_Client_Exception thrown

Invalid KS "OTUwM2ZiNTQ3NWNhNmJkMjMxNDMzMGZkYWJlODk4YmI4MGZlNmIwN3wxMDE7OzE0Njk2MTU2NjI7MjsxNDY5NTI5MjYyLjk2MDM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"