Hi Chandan ,
Please verify if the template files are present inside the developer installation folder.
i.e. check inside “Developer\templates” folder.
replace it’s contents with the content of a working webMethods developer folder and then try.
Secondly also verify if you have proper access to edit the service or not.
Please reply if this resolves your issue.
#webMethods#webMethods-General#Integration-Server-and-ESB