Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 727d4d986ed67f1caaed7f486514a8db943463f56cfb64f57d2634779b155c3f:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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