I have a number of resistance pieces, as soloing old content is a time-passer between raids...have level 70 purple stuff, northrend greens & other random pieces of resist gear; exported with rpgo character profiler. Since the TankDK module doesn't even have the option to specify resistance (fingers crossed), I tried using the DPSDK module to figure out what pieces would be optimal. If I tell it to optimize either directly for nature resistance, for example, or tell it to optimize for health and specify the (nature resist >= 350) stipulation, it will come back with an unhandled exception. I've attached the Rawr character profile that can generate this error, and the Unhandled Exception text is below:

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************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
at Rawr.Optimizer.ItemInstanceOptimizer.PrivateOptimizeCharacter(Character character, String calculationToOptimize, OptimizationRequirement[] requirements, Int32 thoroughness, Boolean injectCharacter, Boolean& injected, Exception& error)

// EXTRA ERROR TEXT MOVED TO FILE