Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 2e0fa80d39de3f475dd361ae034a93213b787d04814b6f40d1db8840a67ef7ba:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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