When I was working with a SSIS project at a customer, I got the following error.

Error: Could not get a list of SSIS packages from the project.

I had CreateDeploymentUtility=true.

That error description apparently indicate, that there is an error in the dtproj file.

The solution: Set CreateDeploymentUtility=false, and then build the project again. The you will get a specific error telling you what is wrong in the  dtproj file. Correct the error, and enable CreateDeploymentUtility again.