Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b23eb57540fb2b8cfe1ce198ce0e093e0bbfd87ac64b85f0a43699e4cc362f0f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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