报错

[yinian]

instanceRecover()方法中：
this.instanceState.putAll(gson.fromJson(data, new TypeToken<Map<Integer, Instance>>() {
}.getType()));
this.instanceState.forEach((key, value) -> {
if (value.value != null)
this.acceptedValue.put(key, value.value);
});
怎么导入到Idea中一直报错.