Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a4ddf529dd01fab0066d1364739f4516f67f7d110da2aa6dbce94a7f0b884e37:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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