Hello, what's wrong (see below)???? Thank you in advance, Maurizio C:Documents and Settingsxxx1>cabal install FileSystem Resolving dependencies... cabal: Could not resolve dependencies: trying: FileSystem-1.0.0 (user goal) next goal: bytestring (dependency of FileSystem-1.0.0) rejecting: bytestring-0.10.6.0/installed-3a6..., 0.10.6.0, 0.10.4.1, 0.10.4.0, 0.10.2.0, 0.10.0.2, 0.10.0.1, 0.10.0.0 (conflict: FileSystem => bytestring==0.9.*) trying: bytestring-0.9.2.1 trying: directory-1.2.2.0/installed-678... (dependency of FileSystem-1.0.0) next goal: Win32 (dependency of directory-1.2.2.0/installed-678...) rejecting: Win32-2.3.1.0/installed-071... (conflict: bytestring==0.9.2.1, Win32 => bytestring==0.10.6.0/installed-3a6...) rejecting: Win32-2.3.1.0, 2.3.0.2, 2.3.0.1, 2.3.0.0, 2.2.2.0, 2.2.1.0, 2.2.0.2, 2.2.0.1, 2.2.0.0, 2.1.0.0, 2.1 (conflict: directory => Win32==2.3.1.0/installed-071...) Dependency tree exhaustively searched. C:Documents and Settingsxxx1>cabal install FileSystem --allow-newer Resolving dependencies... Downloading FileSystem-1.0.0... Configuring FileSystem-1.0.0... Building FileSystem-1.0.0... Preprocessing library FileSystem-1.0.0... [1 of 9] Compiling System.FileSystem.Utils ( SystemFileSystemUtils.hs, distbu ildSystemFileSystemUtils.o ) [2 of 9] Compiling System.FileSystem.Types ( SystemFileSystemTypes.hs, distbu ildSystemFileSystemTypes.o ) SystemFileSystemTypes.hs:123:82: No instance for (Applicative (FST m)) arising from the 'deriving' clause of a data type declaration Possible fix: use a standalone 'deriving instance' declaration, so you can specify the instance context yourself When deriving the instance for (Monad (FST m)) SystemFileSystemTypes.hs:123:89: No instance for (Applicative (FST m)) arising from the 'deriving' clause of a data type declaration Possible fix: use a standalone 'deriving instance' declaration, so you can specify the instance context yourself When deriving the instance for (MonadIO (FST m)) Failed to install FileSystem-1.0.0 cabal: Error: some packages failed to install: FileSystem-1.0.0 failed during the building phase. The exception was: ExitFailure 1 Connetti gratis il mondo con la nuova indoona: hai la chat, le chiamate, le video chiamate e persino le chiamate di gruppo. E chiami gratis anche i numeri fissi e mobili nel mondo! Scarica subito l’app Vai su https://www.indoona.com/