Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> d2d3a0d8a6dcd5c342081eedb936b86cf612447b7779f944b8738060e8758734:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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