Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c5848a03531dcc0307acc87d725ea607d250c597f408f8598a03c1354c200b97:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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