Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> e1c01ed516fe9a83029e5242356d52d98b1665d4d7884679bcaca757cfe6d6fe:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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