Kaltura_Client_Exception thrown

Invalid KS "YmY5MTlhOTNiNjBlZTFhNDY1MDc0NjNkY2RkNWU1ZjM0OWVlMWMzMHwxMDE7OzE0NzUzOTMyOTQ7MjsxNDc1MzA2ODk0LjUwMjU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"