Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> f36a9ce583ca9dc096e1f671087c26ad3d8dc907fde1509064e5ff860c774cdd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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