Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8d36a679c1809db6bf20d01df5cd2b06fb44ad6028382b3c945abbf07eff5b71:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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