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After an update to eclipse and the eclipse-fp plugin, I get this error on an existing project:
<no location info>:
module `main:Main' is defined in multiple files: D:\Java\Now\WorkSpace\Haskell\src\APL_hw4.hs
Failed, modules loaded: none.
Hard to tell, is APL_hw4 referenced in several components in your cabal file? EclipseFP does work fine with several files defining Main modules for different executable section in the Cabal file.