Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f9e0e482cf5a232be4956e694be32b63da4c6ee061d99a84b738849c098e0c37:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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