wx.setStorageSync往这个方法里赋值，报错求大神们帮忙看看~~~~

wx.setStorageSync({

          key: ‘sessionKey’,

          data: ‘LTpz53YiR50I7Fn1lKQ2GKepFxqmQIiQj6JNeNTRuIaLiDsyEqmkQZq2s6HHy5Km’

});

我这么赋值，报错信息如下：

parameter should be String instead of Object;

帮忙看看是啥问题~~~~~~~~~~~~~~~~~~~