Kaltura_Client_Exception thrown

Invalid KS "M2Y1YmI3MzhhYjQxOWI2OWJiMjY1ZGZhNGYwMmZiOWVhMDZiODk3M3wxMDE7OzE0NzUyMDY3MTM7MjsxNDc1MTIwMzEzLjQ2NzU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"