Cannot build - get stucked after writting bundle.js

Hi guys, when I try to run make I get stuck in this point:

2016/03/03 14:28:13 IST] [INFO] Server is listening on :8065
[2016/03/03 14:28:13 IST] [INFO] RateLimiter is enabled
7160535 bytes written to ../static/js/bundle.js (39.25 seconds)

I have no clue how to debug/find out what's the problem here. Appreciate any help. Thanks