Your register_plugin was done wrong

.
Add quotes around your parameters or replace them with PLUGIN, VERSION, and AUTHOR.
Code:
#include <amxmodx>
#include <engine>
new lastseen[33]
public plugin_init()
{
register_plugin("Chat Commands", "0.1", "Phantom Warrior")
register_clcmd("say /lastseen", "SeenPlayer")
register_event("ResetHUD","resetHUD","b")
}
public client_PreThink(id)
{
new target,body
get_user_aiming(id,target,body,100)
if (target != 0)
lastseen[id] = target
}
public SeenPlayer(id)
{
new name[33]
get_user_name(lastseen[id],name,32)
if (lastseen[id] != 0)
client_print(id,print_chat,"You last saw %s who currently has %d health.",name,get_user_health(lastseen[id]))
else
client_print(id,print_chat,"You have not seen anyone since your last the last time you spawned.")
}
public client_disconnect(id)
{
lastseen[id] = 0
}
public resetHUD(id)
{
lastseen[id] = 0
}
You don't need to add me in the credits.
EDIT: Errrm, left something out when I originally posted.
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