How to find out the exact issue in Qt

1) I installed above qt version 5.5.0 in my host system and created app.

2) Using angstrom cross compiler i cross compiled the created app.

3) After cross compilation i copied the executable using pen drive and paste in /opt folder target folder

4) if i run like "./MyApp -qws" , it is successfully running but not display anything , because there is no QWS api for Qt version 5.

5) if i run like "./MyApp -platform eglfs" , getting the error like "QWSSocket::connectToLocalFile could not connect:: Connection refused" . How to find out exact problem and resolve it. Pls help