Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ca6302eed04ca4a604b860892126a18acf10a56f80d8dcdd5a54fa4f075a3df0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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