Kaltura_Client_Exception thrown

Invalid KS "NjU4MzEyMDdlODRiNDAyNDM3N2Y2ZDkyNjJiZmZhZmNhNjM5ZDViM3wxMDE7OzE0OTg1NjY0MjU7MjsxNDk4NDgwMDI1LjI4NjU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"