Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c7f566888053d5118ed246704eb7dd69a51a7629bf5618a924c609f4756b675b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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