Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b9e0b632c5dfae0e98d834b4d1f7abeb116723b9dab2a2cda15da0a5465e79df:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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