Common FiveM Server Errors & How to Fix Them

1. Server Won’t Start or Crashes Instantly

What You’ll See:

• Server doesn’t start or closes right after starting

• Console full of red errors

• No response after starting the server

Possible Causes:

• A resource is broken or missing files

• Syntax errors in server.cfg

• Outdated server build or corrupted files

How to Fix:

• Check your server.cfg — make sure all lines are formatted correctly

• Look at the console to see which resource might be causing issues

• Try removing or disabling recent scripts or mods

• Update to the latest recommended artifact build from runtime.fivem.net

2. Resource Errors (Missing, Broken, or Not Starting)

What You’ll See:

• Console messages like:

   

  Couldn't find resource myscript Failed to load script ...

Possible Causes:

• Folder name doesn’t match the resource name in server.cfg

• Files are missing or the folder is nested incorrectly

• Script requires a dependency that isn’t installed

How to Fix:

• Make sure the resource folder name matches exactly what’s in your start or ensure line

• The folder structure should look like:
  resources/[local]/myscript/__resource.lua (or fxmanifest.lua)

• Don’t nest folders — avoid myscript/myscript/

• Check the resource’s readme for dependencies

3. License Key Errors

What You’ll See:

• Console says:

   

  No license key was specified. Could not find a valid license key.

Possible Causes:

• You forgot to add your license key to server.cfg

• The key is invalid or tied to the wrong IP

• The key was created under the wrong FiveM account

How to Fix:

1. Go to keymaster.fivem.net and log in

2. Create a license key using your correct server IP

3. Add this to your server.cfg:

    

   sv_licenseKey "your_key_here"

4. Save and restart the server

4. Can’t Connect to the Server

What You’ll See:

• FiveM says “Server not responding” or “Connection failed after 10 attempts”

Possible Causes:

• Wrong IP or port

• Server isn’t running

• Port 30120 is blocked or misconfigured

How to Fix:

• Make sure the server is online in the panel

• Use the correct IP and port from your server’s details

• In server.cfg, confirm this is set:

   

  endpoint_add_tcp "0.0.0.0:30120" endpoint_add_udp "0.0.0.0:30120"

⚙️ 5. OneSync Not Working

What You’ll See:

• Features like extended player slots, sync, or entity handling don’t work

Possible Causes:

• OneSync isn’t enabled

• Old server build

• License key doesn’t support OneSync

How to Fix:

• Make sure your server.cfg includes:

   

  onesync_enabled true

• Use a recent artifact build that supports OneSync

• Confirm your license key is tied to a tier that includes OneSync (check Keymaster)

⛔ 6. Players Get Kicked or "Timed Out"

What You’ll See:

• Players get disconnected randomly

• Messages like “Timed out” or “Connection lost”

Possible Causes:

• Too many resources running

• Buggy or heavy client-side scripts

• Hosting plan limits (RAM, CPU, network)

How to Fix:

• Disable unused or large scripts

• Monitor console logs for script warnings

• Restart the server regularly to avoid memory leaks

• If it keeps happening, check with support about upgrading your plan

Need More Help?

If you're still stuck, check the console logs closely — they usually point to the specific error. You can also try:

• Reverting recent changes

• Starting the server with only default resources

• Posting the full error message in a support ticket

Keeping your server clean, updated, and organized is the best way to avoid most issues.