Hello again!
Thank you for the update. Checking through the cook log, we now have something concrete:
Message dialog closed, result: Ok, title: Message, text: The game module ‘TestBuild’ could not be found. Please ensure that this module exists and that it is compiled.
This line indicates that your game module is either missing, or not compiled into the project. Since you have already cleared the cache by deleting Saved and Intermediate folders, the next step would be to ensure that module is working as intended.
In order to do this, close UE, go to D:/Nha/Project/UnrealEngine/TestBuild/ and locate your .uproject file. From there, right click on it and select “Generate Visual Studio project files”. After that process is completed, rebuild your project from your .sln file, opening it, and choosing “Build Solution”.