Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 65cb83ab1aa07382fdc5410933a2519eeef0f5d12506f4fe05a8083ea04a75e4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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