Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1118bef0d4079bb2aae01e1f34c131a9eb3fd2ac991d72842f440665a8860214:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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