Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 107f28a3d12721ab414ae38621a9797ad0970b0db7464d21d25c4b34945dba21:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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