Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b6ad5226e64db9547c70f9e0052919c01a9c300e3630f80791188737457e6a00:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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