Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> bd851bc4fc5f292c1bad37e55d8ee737ca702e8f9bdab61317160fbba84f41f0:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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