First question is which client & runuo versions are you using?
Second question is are you hosting the runuo shard on your own computer?
Then to answer your question, assuming you are hosting your own shard:
You should have 2 copies of the client on your computer.
1 copy is used for the server, to be used by runuo to run the game (this is the client referenced in your datpath).
The second copy of the client is what you use to play the game. You shouldn't use the same client that runuo is using as your personal client. So you should have 2 copies of the UO Client on your computer.
Now, both of these Clients need to be exactly the same, just like your players' clients need to match your shard's client.