Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6871304fd1b9b084ceabc255f29ef332a97f2b12192839f11e4372b741bcf823:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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