Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ab7e20b5976949dbd1c7d091a281353e6da61d2a299cb14f351567cb0a131687:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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