Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 8cf339250c924fa5ec44aa514f7157b5c5c5f01cc758ee32d145a2cee7625f28:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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