Kaltura_Client_Exception thrown

Invalid KS "ZGIwNjk2ZDkyYmM4NWExNGI3ZWRhOGE1ZDMwN2VjZGYyYTg0MDA0MnwxMDE7OzE0NzUyMzEwMzQ7MjsxNDc1MTQ0NjM0LjE0MTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"