Can not add mscaptcha.dll to web.config

[testebr]

I use mscaptcha.dll and IIS 7.5,My website have no problem in local. But after I uploaded it there is problem with mscaptcha.dllHere is my error:\[quote\] This application defines configuration in the system.web/httpHandlers section.\[/quote\]And here I put part of my code in web.config:\[code\] <system.web> <customErrors mode="Off" /> <httpHandlers> <!--captcha--> <add verb="GET" path="CaptchaImage.axd" type="MSCaptcha.captchaImageHandler, MSCaptcha"/> </httpHandlers>\[/code\]Thank you for help.