Kaltura_Client_Exception thrown

Invalid KS "Y2ZiMzljNTkyYTIwZjNhODljMTgyMWE3Nzk0NzRjNDQ5NjI0MjI4MXwxMDE7OzE1MDExNjc3NDE7MjsxNTAxMDgxMzQxLjA3MDI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"