Ambiguous method overloading for method java.lang.Long#minus. Cannot resolve which method to invoke

Ambiguous method overloading for method java.lang.Long#minus. Cannot resolve which method to invoke
项目上线，第一次成功，第二次就失败。记录下自勉，希望可以一直成长，一直努力！

 Long lastUpdate = serviceResult.result?.lastUpdate
            if (now - lastUpdate > TimeUtils.TIME_1_HOURS_MILLISECOND) {
                accessToken = getDingAccessToken(getSuiteTicket(corpId), corpId)
                if (StringUtils.isNotBlank(accessToken)) {
                    //放入缓存中
                    cacheService.dingAccessToken.put(tokenKey, ServiceResult.success([accessToken: accessToken, lastuUpdate: now]))
                }
            }

获取token的代码，出现这错误就很难受，导致所有都出错了。存的时候多打了一个"u"–lastuUpdate
在缓存中拿的时候 ”lastUpdate“就一直报这个错误，相当于

Long a = 2
Long b = null
Long c = a - b

尊重每一行代码，每天进步一点