Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> af87c20a804578ab59010effa29f6dadbca32ef2b74298e3c19f62f069cd5f86:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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