尝试运行grunt task cssmin并收到此错误：TypeError：Object＃<object>没有方法＆＃39; isAbsolute＆＃39;

Question

TypeError：对象＃没有方法＆＃39; isAbsolute＆＃39;

cssmin: {
            target: {
                src: ["styles/css/main.css"],
                dest: "styles/css/main.min.css"
            }
        }