Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0d3041fce430f6d5420e50a012bc76fcf0f1073b364d1c3c974ba25289d6c340:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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