Kaltura_Client_Exception thrown

Invalid KS "Y2RiMzA0YzVkNGEyODg5NjQ2MmJlZDcyNjE4OTIzY2E0NzRlZjYxOHwxMDE7OzE0NzU0NDE1NTc7MjsxNDc1MzU1MTU3LjgzMDY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"