Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c5514c6fc844838ba2ac28dfa834d3e7158fbd8fd0fe2bdc29644ea68ec8fb41:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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