Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> b0762bf355fac6e474b3fc07a7bd44998c1681bedced002a42d6c79da39f45e4:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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