GWT Starter Project won't build - "compiler level does not match..."

I am using Eclipse Kepler for JavaSE and have installed (only) JDK1.7 and JRE1.7 and the latest GWT plugin for Eclipse - on Win7.

When I try to build I get error messages saying: "the compiler level does not match the version of the installed Java project facet."  I've tried using both the JDK and JRE to run with but the results have been the same. I think one error message I saw at some point was complaining that the compiler level must be 1.5 or greater.

After searching this group's forum and finding nothing applicable, I am completely baffled. Can anyone help?
...Bob

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