{"errcode":40001,"errmsg":"invalid credential, acc

https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=xxx

{“errcode”:40001,“errmsg”:“invalid credential, access_token is invalid or not latest hints: [nhNAkiuhE-T.hcva!]”}

token为啥多次调用的时候，就报这个错