Wormwood cant heal himself

Ever since i joined my friend server i cant heal myself with wormwood i unchecked all the clients mods and still doestn work also tried every fertilizer and asked my friends to heal me but doesnt work eaither.. I only found 2 bug reportsd about this but i cant find what i could do about it

Also when i try to heal myself with the fertilizer wormwood says 'i can't do that'

 any help?