Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 1668f362030f3ae8f1b2ff01e339abe309cc069a57e0db315ebef112bda1553e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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