Font is all squares when testing mod

i am trying to make animations for custom npc, im following a guide and i have done everything he does, but when i try to run the mod thorugh mcreator or the game crashed right before finishing loading. But when i export the mod and try it this happens
https://imgur.com/a/nrFqXBA

and when i try to create a world it redirects me to that page
Help please!!!