Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> a05d66adc079c18c236e5ea28647065a5492709d9350dc80dd4186d0cb25e5ac:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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