I've been making a game multiplayer, I had change the c++ code it will say "The following Modules are missing or built with a different engine version: Myproject6" I will then ask me to rebuild the file but it won't

Development Programming & Scripting Multiplayer & Networking
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You really need to give more information.
If you can build it from VS but cannot launch, then check configuration is set to DevelopmentEditor
If you can’t build it, then without logs we cant help you