Handler added to protocol class.

src/engine/net/client/Protocol.java

@@ -42,7 +42,7 @@ public enum Protocol {
     ARCPETCMD(0x4E80E001, PetCmdMsg.class, null), // Stop ArcPetAttack, Toggle Assist, Toggle Rest
     ARCPOWERPROJECTILE(0xA2312D3B, null, null),
     ARCPROMPTRECALL(0xE3196B6E, PromptRecallMsg.class, null), //Recall Prompt
-    ARCREQUESTTRADEBUSY(0xD4BAB4DF, InvalidTradeRequestMsg.class, null), // Attempt trade with someone who is already trading
+    ARCREQUESTTRADEBUSY(0xD4BAB4DF, InvalidTradeRequestMsg.class, AttackCmdMsg.class), // Attempt trade with someone who is already trading
     ARCSERVERSTATUS(0x87BA4462, null, null), //Update Server Status
     ARCSIEGESPIRE(0x36A49BC6, ArcSiegeSpireMsg.class, ArcSiegeSpireMsgHandler.class), // Activate/Deactivate Spires
     ARCSUMMON(0xFD816A0A, RecvSummonsRequestMsg.class, null), // Suspect Recv Summons Request