Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 21280f37c09033d7190640bae6097dc9892b99d7d4f95e98e7625f59c420b962:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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