Realms (429) Bug

I was just playing with my friends today and I left for a second and when I tried to re-join, it said Realms (429) on my screen. This has happened before and I fixed it, but this time I did the same thing and it didn't work I have tried installing java again using a different launcher. Nothing has worked. I need this fixed before Christmas. We are doing presents and I need to be there. Please help me.