Kaltura_Client_Exception thrown

Invalid KS "YTQ5NzFhMjdjOTRjMWJhOWEyMjhkOGU0NGMxMDZlMmExZjUzYWFiNHwxMDE7OzE0Njk3NDE0MTA7MjsxNDY5NjU1MDEwLjQ3Mjg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"