Kaltura_Client_Exception thrown

Invalid KS "NjhhZDQ1OGI5NjRkODU1MTEyNDgzN2Q4OWQ0N2I5MmNlNGIwZmI0MXwxMDE7OzE1MDEwMzEzMjk7MjsxNTAwOTQ0OTI5LjcyMjQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"