Problem using master page in Ajax Enabled Website

[Therasa]

Hi All,

I have created a sample Application for Ajax Enabled Website and in
that i have used master page. The Application is working fine but i
got the following error in HTML Source Page.

Error 1 Element 'ScriptManager' is not a known element. This can occur
if
there is a compilation error in the Web site.
Error 2 Element 'UpdateProgress' is not a known element. This can
occur if
there is a compilation error in the Web site.
Error 7 Element 'DropDownList' is not a known element. This can occur
if
there is a compilation error in the Web site.


Is this will affect while we published the website on Net?
Is it desing problem ?
Is there any problem in web.config file?


Pls help me to resolve this problem ASAP.

Thanks in Advance.....

Regards,
Therasa.