Kaltura_Client_Exception thrown

Invalid KS "NGNlYmYwZDg1MjI1ODFiZjE5MzZmMzA3YmRhYTFmY2U1YWI1MTU2ZHwxMDE7OzE0OTU2MTA5ODc7MjsxNDk1NTI0NTg3LjY2MjQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"