Client rec "xml.sax.SAXException: Bad envelope tag: definitions"

Hello once again I would like to thank all of you that reply to my posts.

I have a new issue here a client is calling our webservice wsdl as a provider when attempting to do a call he is getting back they are getting the following error “xml.sax.SAXException: Bad envelope tag: definitions”. This is very strange. Little back ground, i am using an existing wsdl that they were using with a different client and made some changes to the wsdl for example rather than http they now will use https. Please if anyone had a smiliar issue or can help would be greatly appricated.