Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e50aacd707d12bf12c914c6aeaec2a12c2b4a73a2193266042705d6bbdc23fa9:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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