Heal Player on Health Scale, help?

Whats happening is i've got users on a 40.0 health scale, and when they right click an iron_hoe i'm wanting it to heal them 2 hearts but it keeps throwing an error "Health must be between 0 and 20.0", so how do i successfully heal a player a certain amount thats on a health scale?
here's the code i'm executing:

Code:

if (h == Material.IRON_HOE){
                if (p.getHealthScale() == 40.0){
                    if (p.getHealth() < 35.0){
                        p.setHealth(p.getHealth() + 4.0);
                        return;
                    }
                    p.setHealth(p.getHealthScale());
                }
            }

Here's the error it's throwing:

Code:

[16:20:29 ERROR]: Could not pass event PlayerInteractEvent to NachoPlugs v1.0
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:294) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:195) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:165) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:604) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at net.minecraft.server.v1_7_R1.PacketPlayInBlockPlace.a(SourceFile:60) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at net.minecraft.server.v1_7_R1.PacketPlayInBlockPlace.handle(SourceFile:9) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:655) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:250) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:545) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
Caused by: java.lang.IllegalArgumentException: Health must be between 0 and 20.0
    at org.bukkit.craftbukkit.v1_7_R1.entity.CraftLivingEntity.setHealth(CraftLivingEntity.java:81) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    at nachoPlugs.plugs.nachoPlugsListeners.onPlayerInteract(nachoPlugsListeners.java:122) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.6.0_65]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ~[?:1.6.0_65]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[?:1.6.0_65]
    at java.lang.reflect.Method.invoke(Method.java:597) ~[?:1.6.0_65]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:292) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3023jnks]
    ... 15 more
>

Any help appreciated!

 

health must be between 0 and 20.

 

I figured... but I need the player to be healed even if it's higher than 20..

 

Nachoman44 Well, I don't see how thats gonna work if maximum health is 20.

 

So what do you recommend I do for a solution? is there another way I can create this ?

 

Nachoman44 I'm not really 100% on what it is you are trying to accomplish with this. So sadly I can't answer that question.

 

A player has a health scale of 40.0 right? if they use it when their health is less than 35.0 then heal them for 2 hearts... surely this is manageable?

 

They can't have 35 health.

 

Nachoman44 the max of healt is just 20, or you have to set the maxhealth of a player, but i don't know if you did. Each heart is 2 health, so if you set it to 20, you will have 10 hearts.