Kaltura_Client_Exception thrown

Invalid KS "MGFiNzZiYmMwOGI1MmQzMWIzZTUzZmU0MDI3MGY3MjYwM2QxZjUyNXwxMDE7OzE0OTA3MDYwMTc7MjsxNDkwNjE5NjE3Ljk1MjU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"