install warnings and Error: Cannot find module 'bitcoin-core'

[JDJoe]

BCExportAllPrivKeys$ npm install

npm WARN Invalid version: "1"
npm WARN BCExportAllPrivKeys No description
npm WARN BCExportAllPrivKeys No repository field.
npm WARN BCExportAllPrivKeys No README data
npm WARN BCExportAllPrivKeys No license field.

and when atempting to run, I get:

/BCExportAllPrivKeys$ node export.js
module.js:471
    throw err;
    ^

Error: Cannot find module 'bitcoin-core'
    at Function.Module._resolveFilename (module.js:469:15)
    at Function.Module._load (module.js:417:25)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/home/xxxxxxxxxxx/BCExportAllPrivKeys/export.js:1:76)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)