Kaltura_Client_Exception thrown

Invalid KS "MmMwMmRjNGZkYmQ2OThjNWFmYjgyY2Q0ZDU1YWE0YzU0NWJhMTlhMnwxMDE7OzE0NzIyMTg3MTA7MjsxNDcyMTMyMzEwLjU0NzU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"