Kaltura_Client_Exception thrown

Invalid KS "MDYxMDk4NzEyMjU4ZDk1NjAzYWE2YmJmZDZkMmY2ZDdiMDI4NTU5MXwxMDE7OzE0OTMyMTAzOTA7MjsxNDkzMTIzOTkwLjQ3OTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"