Kaltura_Client_Exception thrown

Invalid KS "ZmU5Nzc5YzJiYzhjNjYwMDMxZjcwN2E4OGYyMGFhZTgxYzhjOGFjMnwxMDE7OzE0ODc4NDg1ODU7MjsxNDg3NzYyMTg1LjQ2MzM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"