Error reading .npmrc

[dublx]

MacBook Pro 10.9.2
node -v; npm -v;
v0.10.26
1.4.3

$ regsw
fs.js:695
  return binding.readlink(pathModule._makeLong(path));
                 ^
Error: EINVAL, invalid argument '/Users/lf/.npmrc'
    at Object.fs.readlinkSync (fs.js:695:18)
    at Object.list (/usr/local/lib/node_modules/registry-switch/index.js:34:84)
    at Object.<anonymous> (/usr/local/lib/node_modules/registry-switch/bin/cli.js:36:17)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:902:3