Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 685ee5f8903465f00428f542204f32b3693bb55266ba9535a5a851bba37a4dde:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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