On element appear error for the assignment 2

in assignment2…my first transaction was done perfectly…then come to 2nd transaction it shows the on element appear activity…
I already set repeatforever= false;
any other ideas…whats the reason…it process 1 st transaction is good…y it throw the error for 2nd transaction

After the IF condition or whatever you are using, assign again the value to false @Nambi

its not worked