Well.....the error by itself doesn't say much.....but it seems that doesn't have any information regarding to samba installation.

Could happen if you compile manually (./configure && make && make install) the software, samba in this case, so, the packet manager of FC doesn't have any records of the installation.

Try the install through yum or something like it (as far as I remember there's some gtk version of yum) to install samba, is one way to get around the problem

The other way will be checking step by step what did you do to install samba before...



Regards