Whenever I try to start up Minecraft with the medieval weapons mod, it always crashes giving me this error:

Could not find required mod: medievalweapons requires {fabric @ [*]}

Please help

This basically means you need fabric api https://www.curseforge.com/minecraft/mc-mods/fabric-api but if you check the relations tab on curseforge for the medieval weapons mod you will see it also needs cloth config api https://www.curseforge.com/minecraft/mc-mods/cloth-config