Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fb27692572877b6fbc89c2c8f5fce057bf3b4470d6d690ff6cffd41dc010b877:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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