OrderClose error 4108 how can I do this to remove this error?......I'm a beginner

[valfid]

bool ris; 

bool ris2; 

if (OrderType()==OP_BUY &&mc1>mc2&&mc01<mc02 ) 

ris=OrderClose(ticket,lots,Bid,3,clrAqua); 

if(OrderType()==OP_SELL && mc1<mc2 && mc01>mc02) 

ris2=OrderClose(ticket,lots,Ask,3,clrBrown);

return(0);

[William Roeder]

1. When you post code please use the SRC button! Please edit your post.
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2. 4108 means something completely different in MT5.

   4108

   ERR_INVALID_TICKET

   Invalid ticket

             Runtime Errors - Codes of Errors and Warnings - Standard Constants, Enumerations and Structures - MQL4 Reference

   Why did you post your MT4 question in the Root / MT5 General section instead of the MQL4 section, (bottom of the Root page?)
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3. if (OrderType()==OP_BUY &&mc1>mc2&&mc01<mc02 ) 

   You can not use any Trade Functions until you select an order.

   ---

4. ris=OrderClose(ticket,lots,Bid,3,clrAqua); 

   Obviously your ticket variable is bogus. Do you even check if the order has already been closed, or if you haven't opened one yet?

5. Check your return codes for errors and report them.
             What are Function return values ? How do I use them ? - MQL4 and MetaTrader 4 - MQL4 programming forum
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6. Use the debugger or print out your variables, including _LastError and find out why.

[valfid]

you're right I'm wrong