When I build my solution with a bunch of cloud projects, I see one or more \"Error: Object reference not set to an instance of an object\" messages in the output. When I try
I had a similar issue when a publish exited out and I started receiving the 'Object not found' error. VS2013 (in my case) was reporting that 'diagnostics.wadcfg' was missing and had unusually stored this into a different directory.
By going into the project file (.ccproj) and removing the erroneous entry from the 'Project\ItemGroup\Content Include "\diagnostics.wadcfg" and reloading the project - everything kicked back into life.
Failing that, check a working project file against the offending project file for inconsistencies.