Kaltura_Client_Exception thrown

Invalid KS "YzVkM2U1M2Y0NDk1ZTk2MTcwNTk0MWI1NTM5OTFiZjlhODJjNjhmYnwxMDE7OzE0OTM1MTA2MzQ7MjsxNDkzNDI0MjM0LjI5NDI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"