PocketCloud doesn't work on my Android!

When I opened the program, it started successfully. But when I tried to connet with my computer, there appeared a black box with a big logo of PocketCloud in it and I cannot stop it and there's nothing but black behind the box.
And when I tap the "Upgrade PocketCloud" at the bottom of the main window, the same thing appears but I can get out of it using the Back botton.

Does someone know what's the problem? Thank you.

My device:
Android 2.2.2, 320*240 screen, 600MHz CPU, MultiTouch supported.