Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 4b837e1067f8fed838691d2831bd2c031c3a57716a7c95a2616064628c246a90:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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