Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d54f079e72c408725e56ed1fa046635a8c0576cfb06f39e29d93b517814cbda2:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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