WXLaunchMiniProgramReq *launchMiniProgramReq = [WXLaunchMiniProgramReq object];

    launchMiniProgramReq.userName = @"gh_52e42316fa01";

   [WXApi sendReq:launchMiniProgramReq completion:^(BOOL success) {

    }];

但是打开失败， 显示appid没有传进去

wxlog:send req[<WXLaunchMiniProgramReq: 0x281bf7200>], appID:(null), universalLink:(null), sdkVersion:1.8.7.1

wxlog:Error:send req fail, no register appID!

请问有人遇上过类似情况吗？