Kaltura_Client_Exception thrown

Invalid KS "NGU2ZDQzYTAzODY2ZTJhMDE2MTIwM2ZkYWMyM2RhNWFjNWE5NzAwZXwxMDE7OzE1MDExNTM1NzY7MjsxNTAxMDY3MTc2LjkzODM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"