Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> ce3e7d22fa9b3f3ed9a03a02da36b2c9818ed9d7107b249e3a6f33b09910da6b:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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