Kaltura_Client_Exception thrown

Invalid KS "NjgxY2YzNDhiNDk1NzJlMGEzMjNhYWJlZDgxMDZjOWUxNTQyZjE1YXwxMDE7OzE1MDA3MDUxNzE7MjsxNTAwNjE4NzcxLjEzMDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"