Cannot run qn.m along with qn.dll

I tried loadlibrary('qn.m') and MATLAB 2017b throws error.

```
Undefined function or variable 'qn_proto'.

Caused by:
    Error using feval
    Undefined function or variable 'qn_proto'
```

I also tried simply running a  = qn(x) where x is a vector and it shows

> Output argument "result" (and maybe others) not assigned during call to "qn".