Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 3f781b266f06215e7cecff6fe9e95a32a29d4ac2ddf3a3946733dcd88faeae30:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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