Here's a quick checklist:
- does your server have enough RAM? At least 200 MB are recommended?
- did you follow the installation guide thoroughly and installed all required dependencies?
- do you run the bot on an officially supported OS? Windows, Debian, Ubuntu are officially supported.
- did you try setting the locale manually like it says in the "Troubleshooting" section of the installation guide?
- did you copy the plugin like it says in the documentation?
- make sure the server exists at the given location
- make sure your client is up to date since older versions might be blocked
- make sure the security level is lower or equal to the clients identity level