Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> c7c8e1957f291ef33276e8a44de3cf5ea33d77c67fad64539744d9cd0b096e24:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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