Minecraft Crashed or Stuck

If I want my client to join my server then minecraft crashes by suddenly giving a red screen while loading and then closing (no error message visible) if it remains open then it hangs on loading source packages. I actually see my figure in my server and he is also recognized in the server. However, I can't see anything on my own screen because I then get stuck on the loading source packages screen. so he can stand all day. this has been playing since yesterday around 4 pm. I have this on both my computer and my laptop. I already tried several things before I put in this ticket. Have already contacted gamers (according to insert a ticket). and they sent me here. Reinstalling Minecraft makes no difference. Java works fine on both computers. If you need any more information, I'd love to hear it.