ThankYou

Hi I just want to play fire and ice minecraft mod but this keeps showing up I'm not sure how to fix this. The only mods I have are citadel and ice and fire I am using forge 1.16.3 Please how do I fix this? Thank you in advance for all the answers. Sorry if this problem is really really easy to fix I'm dumb and just cant figure out what to do. Thank you again in advance.