Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 35c2660c6f453e0464a3b352c3ad3ebafcea6943843687bf23934e1fd9462502:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

error: pre-condition failed: listing has already been purchased
   --> 4eb8a10cb9f87357.NFTStorefront:243:16