Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c693c006eb57bb1ef0e7dd508d993528b2f0161027a2d9b74cda14540cd20459:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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