Starting NFS kernel daemon fail

[kapenware]

hi,  everyone, I'm trying to setup an NFS server on my PC. I recompiled the
kernel, installed the nfs-utils, and also installed nfs-kernel-service.
After these, I configured my /etc/exports like this:
/var/owr *(rw,sync)

then I chmod -R 777 /var/owr, but when I started up the nfs service:
/etc/init.d/nfs-kernel-service start

it showed me this:

* Exporting directories for NFS kernel daemon...
   ...done.
 * Starting NFS kernel daemon
   ...fail!

could anybody tell me what's wrong with this?

thanks...
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