server did not recognize the value of http header soapaction http

I am getting this message. The application is written in .net and the web service too...

It was all working fine before but then one of the developer added few method to web service and it;s not working since then.

Any help would be appreciated.
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AanvikConnect With a Mentor Author Commented:
Thx... but resolved it inhouse. Due to some structure changes in the function wsdl was no longer valid so need to refresh the dll reference and it worked.
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