It’s done guys!!! Thank you for your help, here is my fix:
So, I downloaded 7-zip(Link for it is here https://www.7-zip.org/), then I just did what Boba said, Open your project file with 7-zip, open the folder “assets”, and then open folder “external_comps”, if you find inside of this folder the following foldders “assets” , “scr” and " youngandroidproject" just delete these folders, MAKE SURE TO MAKE A COPY OF YOUR PROJECT BEFORE DOIS THIS PROCEDURE, just in case if you do something that you shouldn’t.
I have no clue why did type of problem appened, if you know something, let me know.
Happy coding!!!