WCF Service stops working, error is in web.config: cannot add duplicate collection entry of type 'add' with unique key att name set to 'scripthandlerfactory'

Question

My web service (wcf) stopped working all of a sudden.

I compared my web.config with older versions and they all have the exact same elements so I am very confused why all of a sudden I am getting this error message.

Have any of you run into this problem before?

Filename: web.config Line Number 151 Error: cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'ScriptHandlerFactory' ?

Answer 1

I always get burned by this on deployment, and its not my web.config. 99% of the time it has to do with the parent websites web.config being inherited to the child webapplication. Has anything been changed on that?

What I usually do is add a <remove> tag for what ever section is giving me the error, but for some that cant be done (im thinking group sections) and just need to be given a different name.