Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 31e61e8070bff6e121b9f131b26e546248038361c6783fdc390e53f4f23ae0f5:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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