[plugins not working when they where just working :<]

I updated my plugin custom heads and now it just wont work it at least shows it exists but its just not showing reason why its not working its just not working

[plugin isn't downloading]

oki

[plugin isn't downloading]

bru iv worked over 7days on this server it says on minehut

 

[plugin isn't downloading]

I put the plugin in it says I put it in I restart server and the plugin disappears how can I fix this?