Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 13fb31fb27cc716851fe18fea7ac456652abc4dd87de179f7fd3bfcc2dd3050c:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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