Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1d931419a5a7274247f1d3ec86bc2ac868594727547fe7bcc939dd3a558ce8df:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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