Hi. I converted my yesod app 0.7 to 0.8, and success to compile and run the program. but, could not run by yesod devel. ----------------------------------------- $ yesod devel (snip) Configuring kestrel-0.1... Testing files... Rebuilding app yesod: bind: resource busy (Address already in use) Preprocessing executables for kestrel-0.1... Building kestrel-0.1... Installing executable(s) in /home/cutsea110/.cabal/bin No package to register Calling runghc... dist/devel.hs:2:0: Failed to load interface for `Controller': it is not a module in the current program, or in any known package. Testing files... Testing files... Testing files... ----------------------------------------- This means what? Incidentally, ghc 6.12.3, cabal 0.8.2, haskell-platform-2010.2.0.0, yesod-0.8.1. thanks.