//(project names Xed out for privacy purposes)

1>------ Build started: Project: XXXX1, Configuration: Debug Any CPU ------
1>Validating Web Site
2>------ Skipped Build: Project: XXXX2, Configuration: Debug Any CPU ------
2>Project not selected to build for this solution configuration
//not pictured: 11 more messages like this for skipped projects XXXX3 through XXXX13
1>: Build (web): Object reference not set to an instance of an object.
1>
1>Validation Complete
14>------ Skipped Build: Project: XXXX14, Configuration: Debug Any CPU ------
14>Project not selected to build for this solution configuration
========== Build: 0 succeeded or up-to-date, 1 failed, 13 skipped ==========