Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c6be1b8457aa6bc0e38eaa642952ed7a415ef00be3a78183460e619bb9136452:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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