Attach extension action "EnableSoapMTOM" cause error?

Hi all,

Although I follow the instruction of this post ""  correctly to intergrate extension action "EnableSoapMTOM" to  "OnBeforeRequestAdvanced" of SOAP consumer but it still cause this error below

This is screen that I attach "EnableSoapMTOM" action to "OnBeforeRequestAdvanced"

When I remove extension action "EnableSoapMTOM" from  "OnBeforeRequestAdvanced", error disappear. So I guess "logic code" of extension action in .Net Visual Studio is reason why this error happen but I don't know how to fix it. I am really appreciate if anyone can help me.


Huy Nguyen,

Hello Huy,

Have you tried to use the supported extension that has already that method there?