Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c5c503a14db44180260cdbbd506ce09a0f7f8d3cc2c2e960206b36e4cedef3b1:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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