Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> fc468ab7084af3f406d46fea4e52aaff33eaa20add4be7eaa4623527fc925924:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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