Cursor "failed to create client" due to spaces in path

[ChuloIva]

Getting this

on Unity side everything seems to be working

[yzzky]

same problem，how to solve it ？

[Fouad-Mhz]

same

[justinpbarnett]

Ah, good callout. Looks like the spaces in your project folder "My project (1)" are causing an issue with the command. Just the way commands work, every space they think is a new action. Easy fix! Just add quotes around the path.

Immediate fix:

1. Go to Window > Unity MCP > Manual Setup > Open File
2. Add escaped double quotes around your path by adding \" to the front just inside the first double quote and \" to the end just inside the last double quote

Your new config should look like this:

{
  "mcpServers": {
    "unityMCP": {
      "command": "uv",
      "args": [
        "--directory",
        "\"/home/.../.../Python\"",
        "run",
        "server.py"
      ]
    }
  }
}

This should get you going until I have a chance to update the auto-config.

[justinpbarnett]

Or if that doesn't work, try taking the spaces out of your folder names (I'd generally advise that anyway for any folders you make on a computer, they don't like spaces).

[ChuloIva]

Great! That worked!

Didn't name the project I was quickly creating a new one just to test mcp, so unity defaulted to something. But yeah good general tip for not using spaces for folder names :D

What I did was change the name of the project, change the name in cursor path and then reset stop/start bridge, clicked auto generate config and then restarted cursor and checked if the paths are okay.

So just give a bit of everything a bit of reset and with the new space-less project name, it works!

Thanks again for quick feedback! kudos!

[justinpbarnett]

Updated the way the server is installed in PR #82 that should fix this issue