Can't make MCP working on the latest, version 0.48.9

Help! I tried to use MCP for the last two days on Cursor, but failed.

I am running Cursor on Windows 11 Home, Build 26100.3775. The mcp.json is as follows:
{
“mcpServers”: {
“cursor”: {
“url”: “https://cursor.sh/api/v1”,
“capabilities”: [“chat”, “edit”, “rewrite”, “command”, “doc”]
}
}
}