Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 0242f2abc705642e6c215beb0ec556e86c268875962899e70b0a1cf2fb118a46:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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