Desculpa que eu falo en Ingles, porque eu não falo suficiente Português. Posso falar Espanhol tambem se queres.
Could you please type ls -l /dev | grep urandom
in a terminal and post the output here?
It would be nice if you could tell us which architecture (i386, AMD64, PPC,...) you're using, which operating system you use (Ubuntu Dapper?) and which version of aMule.
The error usually means, that there too many opened files. You can check this by typing cat /proc/sys/fs/file-nr
in a terminal. The first number should be significantly lower than the last.