Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e0fb51bb108d940aa20a4481fa4490e63953a7051b0c1af781ebd1435349fc0b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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