Last week performing a NAV 2013 update training, I was confronted with the above message when opening the layout from C/SIDE in Visual Studio 2013. "Ouch", I thought, "apparently trusting too much on my installation to work well. Should have checked." Surely after my laptop re-install some weeks ago.
"OK, let's click OK and see," I said to myself, crossing fingers. Luckily Visual Studio opened up showing me the layout of the report and indeed a useful message in the output window:
Typically a case of my stringiness when installing Visual Studio (or in general any other software package): always trying to get away with a minimal install. I had unchecked all optional features.
Let's check the Web Developer Tools and update the installation.