Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2e49abe194a444f4667505673347d3ca921585971e59e07e1806c7e42a138fb1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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