It seems like your old server have some customization. You need to create custom application in order to migrate.
Export all the changes/customizations made by your developer to the custom app, push this custom app to git and pull on new server. Run migrate command, your customizations will be there.
Would be nice if you add some text to let members to know what the issue is and what assistance you need. Just putting up image with couple of words as thread heading and expecting the community members to decipher your issue is cumbersome and kind of rude.
It was very generous of @asharamseervi to reply.