Monoco Edtior is not letting me build or npm run start?

Questions
2

Here is the build error:

[10:57:53] 'buildes6' errored after 19 s
[10:57:53] Error: TSC Failed.
    at formatError (C:\Users\pryme\AppData\Roaming\npm\node_modules\gulp-cli\lib\versioned\^4.0.0\format-error.js:21:10)
    at Gulp.<anonymous> (C:\Users\pryme\AppData\Roaming\npm\node_modules\gulp-cli\lib\versioned\^4.0.0\log\events.js:33:15)
    at Gulp.emit (events.js:201:15)
    at Gulp.EventEmitter.emit (domain.js:471:20)
    at Object.error (F:\gitHUB\Babylon.js\node_modules\undertaker\lib\helpers\createExtensions.js:61:10)
    at handler (F:\gitHUB\Babylon.js\node_modules\now-and-later\lib\mapSeries.js:47:14)
    at f (F:\gitHUB\Babylon.js\node_modules\once\once.js:25:25)
    at f (F:\gitHUB\Babylon.js\node_modules\once\once.js:25:25)
    at tryCatch (F:\gitHUB\Babylon.js\node_modules\async-done\index.js:24:15)
    at done (F:\gitHUB\Babylon.js\node_modules\async-done\index.js:40:12)
    at F:\gitHUB\Babylon.js\Tools\Gulp\tasks\gulpTasks-librariesES6.js:219:13
    at F:\gitHUB\Babylon.js\node_modules\shelljs\src\exec.js:127:9
    at ChildProcess.exithandler (child_process.js:311:5)
    at ChildProcess.emit (events.js:196:13)
    at ChildProcess.EventEmitter.emit (domain.js:494:23)
    at maybeClose (internal/child_process.js:1000:16)

It just sucks because it gets through the majority of the build then starts drops this after lines and lines of this stuff:

./node_modules/@types/react/index.d.ts(2683,14): error TS2300: Duplicate identifier 'LibraryManagedAttributes'.
../../../node_modules/@types/react/index.d.ts(2949,14): error TS2300: Duplicate identifier 'LibraryManagedAttributes'.
../../../node_modules/@types/react/index.d.ts(2962,13): error TS2717: Subsequent property declarations must have the same type.  Property 'a' must be of type 'DetailedHTMLProps<AnchorHTMLAttributes<HTMLAnchorElement>, HTMLAnchorElement>', but here has type 'DetailedHTMLProps<AnchorHTMLAttributes<HTMLAnchorElement>, HTMLAnchorElement>'.