Getting runtime error

[jde08]

Im getting this error when I run my program on a different:

this application has requested the runtime to terminate it in an unusual way.

my code runs in the usual way on my computer.

Any advice?

I read I might need qwindows.dll in a platforms folder but I cant find it.

[ChrisW67]

You need to deploy all the Qt libraries and plugins, and third-party run time libraries that your application depends on. If you are using Qt 5 then that will include a plugin for the platform; you should find that in the plugins/platforms folder of your Qt install.
Deploying an Application on Windows: Creating the Application Package