ide-haskell-hie
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Plugin throws this Error, any ideas?
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The first two are configuration issues. You need a version of HIE that was compiled using the same version of GHC as you are using. Your project is using an old GHC: either upgrade your project or compile HIE with GHC 8.0.1.
The second: go read the referenced doc.
The third: look at your files factorial.hs and helloworld.hs. If they both have "main" functions then that is the problem.