Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ae62afd8fc71401a56c0eb8dff89254262f44bb62781cc7e9008476b4363c141:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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