NPM install in the process of error resolution

NPM install-g Configurable-http-proxy

Error:

NPM http GET https://registry.npmjs.org/configurable-http-proxy npm http GET https://registry.npmjs.org/ Configurable-http-proxy npm http Get https://registry.npmjs.org/configurable-http-proxy npm err!     error:cert_untrusted NPM err!     At Securepair.<anonymous> (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] (tls.js:469:13) NPM err!     At CleartextStream.Readable.read (_stream_readable.js:320:10) NPM err!     At encryptedstream.write [as _write] (tls.js:366:25) 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 are need help, your may the this *entire* log, NPM err!     Including the NPM and node versions, AT:NPM err!  
Execution: NPM config set Strict-ssl false

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