Kaltura_Client_Exception thrown

Invalid KS "ZDVkZmVlMDc0MjRkNWM3NDljYmU4YWQ1Y2QxZmI1YjBmMzc4YjQ1NXwxMDE7OzE0NzQ4NDQ4Njc7MjsxNDc0NzU4NDY3LjExODQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"