Is that the entire code? If it is, the you need to use plugin_init routine.
Code:
public plugin_init()
{
register_plugin("Fun Health","0.1beta","iheartshrooms")
p_enabled = register_cvar("funhealth_on","1")
p_givehealth = register_cvar("funhealth_bonus","50")
p_spawnhealth = register_cvar("funhealth_spawn","300")
register_statsfwd(XMF_DEATH)
}
__________________