"Cannot delete temporary dir" when building

[sklink]

• Version: 6.0.2

• Target: Windows, 64-bit

I have seen this error before but can't remember how I fixed it. Command Prompt is running with administrator privileges. I've also tried deleting the files in Local\Temp to see if that would fix it -- it's definitely something created during the build process.

Warning: Cannot delete temporary dir "C:\Users\Matt\AppData\Local\Temp\electron-builder-m0d1vS": Error: EPERM: operation not permitted, unlink 'C:\Users\Matt\AppData\Local\Temp\electron-builder-m0d1vS\1-setup.zip'
    at Error (native)
From previous event:
    at TmpDir.cleanup (D:\dev\becomethegamer\overlay\build\node_modules\electron-builder\src\util\tmp.ts:59:18)
    at promise_1.executeFinally (D:\dev\becomethegamer\overlay\build\node_modules\electron-builder\src\packager.ts:97:132)
    at Object.<anonymous> (D:\dev\becomethegamer\overlay\build\node_modules\electron-builder\src\util\promise.ts:20:13)
    at throw (native)
From previous event:
    at tsAwaiter (D:\dev\becomethegamer\overlay\build\node_modules\electron-builder\src\util\awaiter.ts:10:47)
    at Object.build (D:\dev\becomethegamer\overlay\build\node_modules\electron-builder\src\builder.ts:195:52)
    at Object.<anonymous> (D:\dev\becomethegamer\overlay\build\node_modules\electron-builder\src\build-cli.ts:27:28)
    at Module._compile (module.js:541:32)
    at Object.Module._extensions..js (module.js:550:10)
    at Module.load (module.js:456:32)
    at tryModuleLoad (module.js:415:12)
    at Function.Module._load (module.js:407:3)
    at Function.Module.runMain (module.js:575:10)
    at startup (node.js:160:18)
    at node.js:445:3
Error: stdout maxBuffer exceeded

After the stdout maxBuffer exceeded there is a long list of lines like this:

2016-08-28 03:02:29> DeltaPackageBuilder: \lib\net45\locales\hi.pak hasn't changed, writing dummy file