Can't add web project to Tomcat in STS

Trying to add a web project to a Tomcat instance.  The project has the Dynamic Web Module project facet enabled (Properties > Project Facets).  Still get this message:

Reason:

Grails project facet is not supported.  Need to use tc Server within STS.

Problems installing Groovy-Eclipse extension in SpringSource Tool Suite 2.7.1

Attempting to install the Groovy-Eclipse extension in STS 2.7.1, I received obscure error messages about a conflicting dependency with a Maven extension.  Using a new workspace did not fix the problem.  When trying with STS 2.8.1, I received a much better error message:  that I could not install since STS was in the C:\Program Files directory.  To verify this, I moved my STS program directory to the root of C: and tried to install the Groovy-Eclipse extension again:  No problems this time.

Comparing against some of my other computers with STS and the Groovy-Eclipse extension installed, it appears that the Groovy-Eclipse extension does not like the space character in C:\Program Files.