Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e808cb14e6d3ef31df66d25ad52421ec0cdc99ed268c5d76bbefe17206f949b8:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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