Kaltura_Client_Exception thrown

Invalid KS "NjM1OTIyNDQyYWFjNmM2MGVhMGMxOWJmMWRjODBmOGI5NjE0NGM3OHwxMDE7OzE0Njk2MjkwMTE7MjsxNDY5NTQyNjExLjMyMDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"