SharePoint Designer 2007 Error when clicking at Edit page layout button

I have got following error when i click edit page layout button:

Could not find a web server at 'oldMachineName'. Please check to make sure that the Web server name is valid and your proxy settings are set correctly. if you are sure that everything is correct, the web server may be temporarily out of service

Here is the detail i would like to share:

I have shifted SP 2007 Solution from one machine to another due to AD change. All the site works perfect except some links not functioning and it gives me this error: An unexpected error has occured: trouble shoot issues with Windows SharePoint Services. To figure out, Then i opened the corresponding page in SharePoint designer 2007 and click on edit page layout button and i got above error: I noted that it still trying to access the page layout from old machine name something like http://oldMachineName/_catalogs/masterpage/pageTemplate.aspx. But as i said i have shifted the solution to a new machine and i am expecting that it should access the page layout from newMachinename http://newMachineName/_catalogs/masterpage/pageTemplate.aspx What should i need to change and where?