Could not activate

[mvdufloth]

I'm getting this error when I try to use some method from my stateful bean:

Could not activate; failed to restore state; CausedByException is:
C:\JBoss4\server\default\tmp\sessions\WarehouseBean-ejrfnfah-e\ejrfwngd-g.ser (O sistema não pode encontrar o arquivo especificado)

I already see wiki (CouldNotActivate), but my bean never passivate... so, I guess that exists some trouble here... I change max-bean-life and doesn't work.

What more can cause this error?
I'm using JBoss 4.0.3

[mvdufloth]

I realize that when ejb is deployed with EAR this error occur, but with JAR only, run ok...

[rsobies]

i have the same problem!

when i connect whith the bean for the first time it is ok

but after 3 minutes i get this error

any body knows why?

radek