Kaltura_Client_Exception thrown

Invalid KS "MDNhMzYyMmUyYzhjZGIwMGU1ZjczNTg1MDY0YzIwMjNkNDZhOTMxYnwxMDE7OzE0NzUxNzEzNDc7MjsxNDc1MDg0OTQ3LjgxOTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"