installation fail

[xa4]

xa4@shanti:~$ npm install smog -g
npm http GET https://registry.npmjs.org/smog
npm http GET https://registry.npmjs.org/smog
npm http GET https://registry.npmjs.org/smog
npm ERR! Error: SELF_SIGNED_CERT_IN_CHAIN
npm ERR! at SecurePair. (tls.js:1370:32)
npm ERR! at SecurePair.EventEmitter.emit (events.js:92:17)
npm ERR! at SecurePair.maybeInitFinished (tls.js:982:10)
npm ERR! at CleartextStream.read as _read
npm ERR! at CleartextStream.Readable.read (_stream_readable.js:320:10)
npm ERR! at EncryptedStream.write as _write
npm ERR! at doWrite (_stream_writable.js:221:10)
npm ERR! at writeOrBuffer (_stream_writable.js:211:5)
npm ERR! at EncryptedStream.Writable.write (_stream_writable.js:180:11)
npm ERR! at write (_stream_readable.js:583:24)
npm ERR! If you need help, you may report this entire log,
npm ERR! including the npm and node versions, at:
npm ERR! http://github.com/isaacs/npm/issues

npm ERR! System Linux 3.4.0-cloud
npm ERR! command "/usr/local/bin/node" "/usr/local/bin/npm" "install" "smog" "-g"
npm ERR! cwd /home/xa4
npm ERR! node -v v0.10.24
npm ERR! npm -v 1.3.21
npm ERR!
npm ERR! Additional logging details can be found in:
npm ERR! /home/xa4/npm-debug.log
npm ERR! not ok code 0

[contra]

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