ASP/Ajax extensions – Sys.Debug is null or not an object
Today I got faced with the impossible error of “Sys.Debug is null or not an object” while using the Ajax Extensions for an ASP website, meaning I couldn’t get my CalendarExtension to work … Googling it, it seemed like a well known error, but if you think that means that it’s fixed in no time, you can think again.
I spent hours reading the question over and over again, and trying out answers ppl gave, but nothing seemed to work for me .. until finally finally finally … I found a website actually handing me the solution to it all 
You can find the link here
After doing what he so very well explains in his article, I restarted my IIS (issreset in start->run) en cleared the cache of my browser (ctrl + F5 for IE) and I haven’t seen the error since!!
Thnx again to Ross Hawkins!
