Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 9f4a0c3b5654df7c260897747df587c81d376f71e563c3ce8adc14a5d36a5adb:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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