Kaltura_Client_Exception thrown

Invalid KS "YzZlZDM5NjY4NDk0YTc5YzM2OTZlMTZhNDQ4YWY1ZDU4MGZiYzc4M3wxMDE7OzE0ODUxNDM4MzA7MjsxNDg1MDU3NDMwLjE1Nzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"