Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2a4a67c4533e61d19e22928b589f4f1ca281e69a044812c9bcb646d2327d26c5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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