Kaltura_Client_Exception thrown

Invalid KS "OWQ3NzhmNDE1ODAxOGUwZmNiMDFmODgzOGUyYzI4MDVmMGMwZGNkMHwxMDE7OzE1MDA4NTA4NDY7MjsxNTAwNzY0NDQ2LjcwMTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"