Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> eb6d714f9d905f287625fa66e1fb330041317ebdcbd19b2ea9428b81aca00d9c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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