Getting Warnings when doing Batch Build on a solution on Visual Studio

Question

I have a solution with 30 project inside. I have rebuild the solution with the 30 projects successfully. However, when I click on Batch Build... and by selecting all to build, I get 360 Warnings.

Here is a snapshot of my screen.

On the Output panel:

========== Build: 30 succeeded, 60 failed, 30 up-to-date, 0 skipped ==========

Here is the link where I have downloaded the project.