[Haskell-cafe] package cache being out of date

Hi, I have a freshly installed Haskell Platform 2010.2.0.0 on Windows 7. When I run ghc-pkg list, I get the following message (besides the expected package info): WARNING: cache is out of date: C:/Program Files (x86)/Haskell Platform/2010.2.0.0\lib\package.conf.d\package.cache use 'ghc-pkg recache' to fix. What does this mean? Is this harmful? (In principal, I could just run ghc-pkg recache, but the installation is replicated on about 20 machines, and I don’t have admin rights on these.) Best wishes, Wolfgang