Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f6b5c84f45ca268be9387f163450bbf3fa6d6d371109757e9542449c19d08207:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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