Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 31820924d01d06e1aff759487a5eeb7fc3cf63d2dac9ddf4b1c736736d870fe7:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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