I'm using: GHC 6.2.1 HSQL 1.4 on a Windows XP machine. I'm trying to the compile the HSQL example using the eclipse Haskell plug-in, but I get the following error message: Chasing modules from: Main.hs Compiling Queries ( ./Queries.hs, C:\workspace\dbtest\out/Queries.o ) ./Queries.hs:3: Failed to load interface for `Database.HSQL': Bad interface file: C:/ghc/ghc-6.2.1/imports/Database/HSQL/GHC/imports/Database/HSQL.hi mismatched interface file versions: expected 6021, found 6020 What it appears is that my HSQL has an interface matching GHC 6.2 maybe? I just downloaded the HSQL 1.4 from the sourceforge site. The windows exe version is HSQL-1.4.exe. Is this the correct version of HSQL? Am I matching the GHC and HSQL versions correctly? If so, do you know what else I might be doing wrong? I am able to compile other programs with no problem. Thanks for help. It is fun to learn a new language and my Haskell books are on order :)