Kaltura_Client_Exception thrown

Invalid KS "NzZkY2U1ZmRhN2E2ZGFkZjNjYmU0MTFkMDllZmEzMGVkYWZjNWNiZHwxMDE7OzE0NzUzMTc3OTA7MjsxNDc1MjMxMzkwLjIwNzE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"