Question Unable to boot into recovery using "Acer Recovery" from market/playstore

Hello. After updating my A500 to the official ICS rom, I easily rooted my tablet succesfully by downloading a program found on this website:

http://forum.tegraowners.com/viewtopic.php?f=30&t=350

Then, I downloaded an app from the market/play store called "Acer Recovery" wich lets you flash CWM recovery (which is built in into the app). The app said it flashed the recovery succesfully. Now, when I press the "boot into recovery" button I get stuck in the Acer logo and on the top left corner it sais in red: Recovery Failed

I would like to flash custom roms. What am I doing wrong?

Many thanks...