Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 107ef43431dc30cf406278c59f1f51c65a4c4b6ee6f2b8676d1fbfa7a6072a57:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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