[aiharkness]

First, I'll say there are many threads like this on the forum, where people have trouble playing youtube videos, they try everything anyone can think of, and no solution. Do a search on your error message and see for yourself. Maybe someone found a solution.

At any rate, use the mobile page, m.youtube.com. See if that works. If not, check your broswer settings in browser options, and experiment. Also, you might clear the browser cache and cookies, and do a hard reset. Then try again.

A hard reset is accomplished by removing the battery, while the BlackBerry is on, and wait 30 seconds before replacing it.