Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 6525d9424409cccf7951afd40f47801f925baecb1bc4b208cdfbeb31a53b5b92:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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