Kaltura_Client_Exception thrown

Invalid KS "ZGJhNmY0Zjk3ZjRkNTM2N2YyYmZkN2I1ODAwOGQ1ZWMzMWZjNjRlZXwxMDE7OzE0ODE0NDc1NjA7MjsxNDgxMzYxMTYwLjc5MzM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"