windows-installer: Unable to build windows installer

development package.json has the following:

  "build": {
    "app-bundle-id": "com.datafiniti",
    "app-category-type": "public.app-category.visual-scraper",
    "iconUrl": "build/icon.ico"
  },

  "scripts": {
    "postinstall": "install-app-deps",
    "pack": "build --platform=all",
    "dist:win": "build --platform=win32"
  }

when running npm run dist:win i run into the following error:

Packaging app for platform win32 x64 using electron v0.37.3
Error: Failed with exit code: 1
Output:
Attempting to build package from 'SpiderSense.nuspec'.
Invalid URI: The URI scheme is not valid.

 at ChildProcess.<anonymous> (/SpiderSense/node_modules/electron-winstaller-fixed/lib/spawn-promise.js:59:16)
    at emitTwo (events.js:100:13)
    at ChildProcess.emit (events.js:185:7)
    at maybeClose (internal/child_process.js:850:16)
    at Socket.<anonymous> (internal/child_process.js:323:11)
    at emitOne (events.js:95:20)
    at Socket.emit (events.js:182:7)
    at Pipe._onclose (net.js:477:12)
From previous event:
    at tsAwaiter (/SpiderSense/node_modules/electron-builder/src/awaiter.ts:10:51)
    at Object.build (/SpiderSense/node_modules/electron-builder/src/builder.ts:30:59)
    at Object.<anonymous> (/SpiderSense/node_modules/electron-builder/src/build-cli.ts:41:2)
    at Module._compile (module.js:413:34)
    at Object.Module._extensions..js (module.js:422:10)
    at Module.load (module.js:357:32)
    at Function.Module._load (module.js:314:12)
    at Function.Module.runMain (module.js:447:10)
    at startup (node.js:146:18)
    at node.js:404:3

Any ideas here?

i have mono version 4.2.3 and wine version 1.8.1. Let me know if you need any more information