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FixStringsFile is a Mac OS X command line tool that we use to sort, validate and perform some other transformations on localizable strings files. This gets run from some of the shell script build phases (via Scripts/CopyLibraryResources and Scripts/BuildStringsFromTarget).

The answer may be as simple as editing your scheme to build FixStringsFile before the Omni framework library targets. But, since we don't currently package our build products from within Xcode (we have a bunch of command line shell scripts that package and sign build products), I don't have an sure fire answer for you.
CTO, The Omni Group