小程序云开发"errCode":-501001？

当云函数中的事务同时处理多个请求(测试时是两个)时频繁包以下错误?

“error”:{“errCode”:-501001,“errMsg”:"[ResourceUnavailable.TransactionConflict] Transaction is conflict, maybe resource operated by others. Please check your request, but if the problem persists, contact us.; "}}