hello anyone who can tell me what do I do ?

Try Set Your environment to the location they suggested

Try building it in intellij first, it sometimes is missing libraries and will fix it
Also try downloading a direct JAR and putting it in your mods folder along with fabric API
https://www.curseforge.com/minecraft/mc-mods/fabric-api

Also you do need java to build it lol

if you need more help make a new issue

also look it up on youtube or something
"how to install hava"