Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0760679388ff341084bd461f2d50196fea9f1570e230dfd2ee80b3e7d44cd229:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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