*Some more research about spell target flags - thanks to Zor for info.

--HG--
branch : trunk

src/server/game/Entities/Unit/Unit.cpp

@@ -973,7 +973,7 @@ void Unit::CastSpell(GameObject *go, uint32 spellId, bool triggered, Item *castI
         return;
     }
 
-    if (!(spellInfo->Targets & (TARGET_FLAG_OBJECT | TARGET_FLAG_OBJECT_UNK)))
+    if (!(spellInfo->Targets & (TARGET_FLAG_OBJECT | TARGET_FLAG_OBJECT_CASTER)))
     {
         sLog.outError("CastSpell: spell id %i by caster: %s %u) is not gameobject spell", spellId,(GetTypeId() == TYPEID_PLAYER ? "player (GUID:" : "creature (Entry:"),(GetTypeId() == TYPEID_PLAYER ? GetGUIDLow() : GetEntry()));
         return;