One of the following actions might help you:
[Refresh the page]
[Try another browser]
You can try to launch the game in another browser, that you probably have on your computer.
[Clear your cache]
You can try to clear your browser cache. If you don't know how to do this, you can find instructions in the internet. Here is a good tutorial - Open Tutorial
[Update your flash player]
You can update your flash player here: Flash Player
Attention! Flash player update won't help Google Chrome users!
[Update your browser]
You need not just update your browser, but download the latest version and reinstal it. That is very important!
If these steps did not help, please contact our support!