Kaltura_Client_Exception thrown

Invalid KS "MGJjMmI2N2NmNTZhNTEyOGU5NmE0ZDkzMmIxYzQyNjZmNzFiZDAwMHwxMDE7OzE0NzUzOTMxODY7MjsxNDc1MzA2Nzg2LjgzNTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"