Run is failed

I build it, then launch with `stack exec rmdf` and get  empty window with log in console
```
INFO  | ThreadId 4   | 2020-02-10 22:08:58.636462 - Missing 4 pre-convolved environment map(s), computing...
INFO  | ThreadId 4   | 2020-02-10 22:08:59.109332 - Downsampled reflection environment in 0.47s
```
What is wrong?

btw, i added .hdr to `latlong_envmaps/` folder and edit Main file.