Haddock fails during validation because "GHC/Types.hs is not loaded"

I've run into an issue with Haddock that prevents me from validating further. The last 100 lines of the build output: http://lpaste.net/92627 The file it claims not to have loaded exists, and so do many others like "GHC.IntWord64" that Haddock doesn't seem to have a problem with in line 88. I've tried running "sh validate" from scratch again, but unfortunately that didn't work either. Searching online for similar problems shows other people had this in the past (with different modules), but no solution is mentioned. Has anyone run into a similar problem recently and could help me out with this? David