Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4cb733593059b9b5c31d2c18225ffefad102581da4efe393ac524b5875071dea:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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