Hi
My game Doesn’t Launch After Packaging .!
how can i fix it??
had no errors wihle packaging
the default third person template works 
Not a lot to go on here. Generally the more information you provide, the better responses you are going to get from the forums.
Anyways, you claim the game doesn’t launch even though it packaged successfully. Do you get an error when you try to launch the packaged game? If you don’t then you should take a look at the logs generated when you try and run the game. They will be located here:
WindowsNoEditor\YOURPROJECTNAME\Saved\Logs
Dumping the contents of the latest log file here will help immensely.
Also, here’s a good tutorial about debugging packaged builds: https://www.orfeasel.com/debugging-packaged-builds/