Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 41b09933081c6d8b01b97e47fe09cfb8ebca77895f2c6cc7a22d638017e8dd78:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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