Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 038da78fc4af15549ec5ac9014ce3a1906d40d6f12715f2c4cff6a7c44a9a93e:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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