standalone runtime errors?

ok so ive recently packeged a game into a standalone .exe. but when i try to run the game i get an error saying “This application has failed to start because pthreadVC2.dll was not found. Re-installing the application may fix this problem.” but when i go to the folder that has the exe in it, all of the files are there, including “pthreadVC2.dll” so why is this error coming up if it never did before?

THANK YOU!!! PEACE!