Kaltura_Client_Exception thrown

Invalid KS "YWFkMzI3NjZhMjJlMWUwNDg1ZTg1MGU4NzBhMDQ5YWI2NzY0MDIxNnwxMDE7OzE0OTA1MzU5MjI7MjsxNDkwNDQ5NTIyLjg5ODY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"