According to the web page that you linked, your phone has the following specs:
- mtk6516 416 MHz CPU
- 512 MB ROM
- 256 MB RAM
- Screen HVGA 800 x 480
The Skype FAQ says:
What do I need to run Skype on my Android phone?
To run Skype on your Android phone, you will need a supported phone running Android OS version 2.1 or above with least 27MB of free memory space on your handset and 600Mhz or more processing power. The supported screen resolutions are 320x240, 240x400, 320x480, 800x480 and 850x480.
So it looks like the app doesn't support your phone's CPU (which oddly seems to be slower than the very earliest Android phones like the G1).
There is more than one official Skype app, it's possible that the one you're using isn't compatible with your phone, but another one might be. See the links in this question to find the Skype apps Can I install Skype on my xperia?Can I install Skype on my xperia?