Error from Visual Studio

The .sln in Audacity has 24 projects. After compiling, the output window of VS indicated 23 projects were successfully built and one failed. I could not find out which project failed. Does anyone have any idea how to find out which fails. VS is the 2013 Community edition.
I have a virus issue. After I compiled the 2.2.1 version to be used with ASIO, I was able to used it without any problem. I tried to compile it into a distributable to see how distributable is created. Then I installed it to my computer. The antivirus detected a Trojan virus upon installation. I downloaded the source code from Does it matter whether I typed https vs http? I did typed instead of Our antivirus software detected the problem and avoid the infection. The original compiled version had not problem and only the distributable upon installation presented the issue. I scanned the source code, the compiled source code and even the distributable without virus detected. Any comment? When I download the source code again using for re-compilation, no virus warning is given when installing the distributable. Weird. any insight?

You should use https when available.
It is probably not likely to be a problem if you use http, but http has no guarantees of secure end-to-end data transfer.
More information:

Modern anti-virus programs use “heuristics” to search for “possible” viruses. Because of the number of viruses, and the existence of viruses that “mutate”, it is no longer effective for anti-virus programs to search only for known virus signatures, so they also search for patterns that look like they “may” be virus signatures. While this improves the chances of detecting viruses, it also increases the chance of “false positives” (signaling that there is a virus when in fact there isn’t).

The website is an excellent resource for checking single files. It uses over 50 anti-virus applications and displays the results. If there is a “heuristic” detection in one anti-virus only, then there’s a good chance that it is a false positive. In that case, you should still treat the file with caution, but don’t assume that it “is” a virus based on one heuristic detection.

Some anti-virus companies update their databases more frequently than others. Some of the lesser known companies may take a week or more before updating. The big name companies update daily, and false positives are removed as soon as they can confirm the status of a reported false positive (usually within a few days).