Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 644c37244419ed3f4d2b289cb981d201d4eef6450b2f4e66e674ef42fd031289:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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