Invalid command 'RPAFheader', perhaps misspelled or defined

When you attempt to restart Apache you may see: [Mon Jul 25 12:40:23 2011] [warn] module rpaf_module is already loaded, skipping [Mon Jul 25 12:40:23 2011] [warn] module rpaf_module is already loaded, skipping

This means it has loaded the old rpaf module.. For me I had to jump into: mods-enabled/rpaf.load

and comment out the old mod_rpaf module.

Simples!