上传APP至AppStore时打包出现U option must have a non-empty value

今天上传APP时要用application loader上传到AppStore上去,打包之后上传的时候报错,如下
1.the u option must have a non-empty value

2.the password must have a non-empty value

解决办法: 1:去iTunes connect下一个application loader3.1的dmg

2:升级Xcode