Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e51f5a64ad2c392ce4b61b90c950873f88ed68be080d5bdd5f834d1efb095633:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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