Java compiler level vs. Installed project facet

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Chi Zeng

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Jul 8, 2012, 7:23:05 PM7/8/12
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I made a Java Google AppEngine application called Guestbook in Eclipse 3.7. However, I am encountering an error that lacks a quick fix:  

Description Resource    Path    Location    Type
Java compiler level does not match the version of the installed Java project facet.     Guestbook       Unknown
Faceted Project Problem (Java Version Mismatch)

All the solutions I have found on Google hint at examining Project Properties | Facets. However, I lack a Project Facets tab under my project's properties.  Why do I lack a project facet tab under properties? What is an "installed Java project facet"? How do I resolve this error?
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