Error :( Some game files are missing and can not be downloaded when the launch is offline. Connect to the Internet and try it. But I'm connected to the internet !!!!! and I also tried restarting the router and the computer

It tells me that some game files are missing, and can not download them if they are offline but I'm online, and do not fix the bug by telling me to try restarting the router.
Does not fuse with all versions !!!!!
I am a great minecraft player, but I can not play with this bug :'-(

Translated with google translator