Build error after upgrading to iPhone SDK 2.2

I went back to an old project I hadn’t worked on in a while and got this error…

ASSERTION FAILURE in /SourceCache/DevToolsBase/DevToolsBase-1148/pbxcore/Target.subproj/XCCodeSignContext.m:458 Details:  Error: failed to locate ResourceRules.plist in…

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$SDKROOT/ResourceRules.plist