diff --git a/neo/Core/TX/Transaction.py b/neo/Core/TX/Transaction.py
index ef11e4519..d8fc43b99 100644
--- a/neo/Core/TX/Transaction.py
+++ b/neo/Core/TX/Transaction.py
@@ -184,6 +184,9 @@ def GetHashData(self):
     def getAllInputs(self):
         return self.inputs
 
+    def ResetReferences(self):
+        self.__references = None
+
     @property
     def References(self):
 
diff --git a/neo/Prompt/Commands/Invoke.py b/neo/Prompt/Commands/Invoke.py
index 63d5c251d..6d04c1411 100644
--- a/neo/Prompt/Commands/Invoke.py
+++ b/neo/Prompt/Commands/Invoke.py
@@ -33,19 +33,23 @@
 from neo.BigInteger import BigInteger
 import traceback
 import pdb
+import pdb
+import json
 
 def InvokeContract(wallet, tx):
 
+
     wallet_tx = wallet.MakeTransaction(tx=tx)
 
     if wallet_tx:
 
         context = ContractParametersContext(wallet_tx)
+
         wallet.Sign(context)
 
         if context.Completed:
 
-            tx.scripts = context.GetScripts()
+            wallet_tx.scripts = context.GetScripts()
 
             wallet.SaveTransaction(wallet_tx)
 
@@ -56,7 +60,6 @@ def InvokeContract(wallet, tx):
                 return True
             else:
                 print("Could not relay tx %s " % tx.Hash.ToString())
-
         else:
 
             print("Incomplete signature")
@@ -131,7 +134,6 @@ def TestInvokeContract(wallet, args):
                                       script_hash=contract.Code.ScriptHash())
 
             outputs.append(output)
-        
 
         return test_invoke(out, wallet, outputs)
 
@@ -169,33 +171,27 @@ def test_invoke(script, wallet, outputs):
     service = StateMachine(accounts, validators, assets, contracts, storages, None)
 
 #    contract = wallet.GetDefaultContract()
-
 #    tx.Attributes = [TransactionAttribute(usage=TransactionAttributeUsage.Script, data=Crypto.ToScriptHash( contract.Script))]
 
-
     wallet_tx = wallet.MakeTransaction(tx=tx)
 
     if wallet_tx:
 
         context = ContractParametersContext(wallet_tx)
         wallet.Sign(context)
-
         if context.Completed:
-            tx.scripts = context.GetScripts()
-
-
-
+            wallet_tx.scripts = context.GetScripts()
 
     engine = ApplicationEngine(
         trigger_type=TriggerType.Application,
         container=wallet_tx,
         table=script_table,
         service=service,
-        gas=tx.Gas,
+        gas=wallet_tx.Gas,
         testMode=True
     )
 
-    engine.LoadScript(tx.Script, False)
+    engine.LoadScript(wallet_tx.Script, False)
 
 
     try:
@@ -213,17 +209,18 @@ def test_invoke(script, wallet, outputs):
                 consumed = Fixed8.One()
 
             #set the amount of gas the tx will need
-            tx.Gas = consumed
+            wallet_tx.Gas = consumed
 
-            #remove the attributes that are used to add a verification script to the tx
-            tx.Attributes = []
+            #reset the wallet outputs
+            wallet_tx.outputs = outputs
 
-            return tx, engine.EvaluationStack.Items
+            return wallet_tx, engine.EvaluationStack.Items
         else:
             print("error executing contract.....")
-            tx.Gas = Fixed8.One()
-            tx.Attributes = []
-            return tx, []
+#            tx.Gas = Fixed8.One()
+#            tx.Attributes = []
+#            return tx, []
+            return None,[]
 
     except Exception as e:
         print("COULD NOT EXECUTE %s " % e)
diff --git a/neo/Prompt/Utils.py b/neo/Prompt/Utils.py
index 09babe277..dd6196871 100644
--- a/neo/Prompt/Utils.py
+++ b/neo/Prompt/Utils.py
@@ -15,7 +15,7 @@ def get_asset_attachments(params):
                 neo_to_attach = Fixed8.TryParse(int(item.replace('--attach-neo=', '')))
             except Exception as e:
                 pass
-        elif '--attach-gas=' in item:
+        if '--attach-gas=' in item:
             to_remove.append(item)
             try:
                 gas_to_attach = Fixed8.FromDecimal(float(item.replace('--attach-gas=', '')))
diff --git a/neo/SmartContract/ContractParameterContext.py b/neo/SmartContract/ContractParameterContext.py
index 68a936ec3..00583b6cd 100644
--- a/neo/SmartContract/ContractParameterContext.py
+++ b/neo/SmartContract/ContractParameterContext.py
@@ -35,7 +35,6 @@ def Completed(self):
 
     def Add(self, contract, index, parameter):
 
-
         i = self.GetIndex(contract.ScriptHash)
 
         if i < 0:
@@ -60,7 +59,6 @@ def AddSignature(self, contract, pubkey, signature):
 
         else:
 
-
             index = -1
             for i, contractParam in enumerate(contract.ParameterList):
                 if contractParam == ContractParameterType.Signature:
diff --git a/neo/Wallets/Wallet.py b/neo/Wallets/Wallet.py
index 3c240b6b4..42b2842be 100755
--- a/neo/Wallets/Wallet.py
+++ b/neo/Wallets/Wallet.py
@@ -499,12 +499,12 @@ def GetContracts(self):
 
 
     def MakeTransaction(self, tx, change_address = None, fee = Fixed8(0)):
+
+        tx.ResetReferences()
+
         if not tx.outputs: tx.outputs = []
         if not tx.inputs: tx.inputs = []
 
-#        for o in tx.outputs:
-#            print("OUTPUT %s " % json.dumps(o.ToJson(), indent=4))
-
         fee = fee + tx.SystemFee()
 
         paytotal = {}
@@ -522,7 +522,6 @@ def MakeTransaction(self, tx, change_address = None, fee = Fixed8(0)):
 
             if Blockchain.SystemCoin().Hash in paytotal.keys():
                 paytotal[Blockchain.SystemCoin().Hash] = paytotal[Blockchain.SystemCoin().Hash] + fee
-
             else:
                 paytotal[Blockchain.SystemCoin().Hash] = fee