ASPNETCOMPILER ASPRUNTIME error: Object reference not set to an instance of an object

Trying to compile a .Net website today and got this strange error.
I tried to wipe any compiled code from the bin folder.  This did not do
it.  What kicked it over for me was a reinstall of asp net framework.

aspnet_regiis.exe -i

Source:

1. http://codecorner.galanter.net/2009/08/17/wdp-error-solution/
2. http://stackoverflow.com/questions/26838946/aspnetcompiler0-0-error-aspruntime-object-reference-not-set-to-an-instance-o