Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 7b2c4c1a694491d04c6960bbc63bcd59634bab55fb8996523a05f3521e1b11ef:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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