`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