Rails - Aug 2006 - `const_missing'': uninitialized ..

bad night !
my db model is like: person has many clients, and clients has many 
infoattributes

so in my computer with script/console I can do
aPerson.clients.first.rooms => and it is ok
BUT in the new server which use rails 1.1.6 I have a

 `const_missing'': uninitialized constant Infoattribute

Any idea ?

arnaud