Electron App Error: EACCES: permission denied, ope

Question

[20:25:45] Using gulpfile ~/Desktop/GitHub/electra/gulpfile.js
[20:25:45] Starting 'build-client-bundles'...
[20:25:45] Starting 'build-client-scss'...
[20:25:45] Starting 'build-client-html'...
[20:25:45] Starting 'build-client-assets'...
[20:25:45] Starting 'build-server'...
[20:25:45] Starting 'watch-client'...
[20:25:45] Finished 'watch-client' after 16 ms
[20:25:45] Starting 'watch-server'...
[20:25:45] Finished 'watch-server' after 1.58 ms
[20:25:45] Starting 'watch'...
[20:25:45] Finished 'watch' after 13 μs
./app/assets/assignment.png
stream.js:74
      throw er; // Unhandled stream error in pipe.
      ^

Error: EACCES: permission denied, open '/Users/ugrerdl/Desktop/GitHub/electra/build/index.js'
    at Error (native)

I got this error when I try to run my app. Btw: if I try with sudo every think work.