Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0a0f1a534ce12aa53e309ac78adabf66d5f06bb1231d15bcdab0f8f45f0977be:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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