Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 38c52c333438ae4b0a0eefc2d785c6a4d82aeb374c39bebd1b2c979c470822cd:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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