As you can see it's a timeout issue. It seems that either the server is too slow or your network latency is too high.

What you can try is to increase the timeout on the client side i.e NeoLoad side to let it wait more time. Here is the procedure:

1. Stop NeoLoad
2. Edit <install_dir>\conf\controller.properties
3. Go to the [General] section and add in a new line: svn.so.timeout=300000
4. Save
5. Start NeoLoad
6. Try again a check out from that NeoLoad.

Also you could try that checkout when the server is not used by anyone else like early in the morning or late in the day. It might help too.