Transaction

[Error Code: 1101] cadence runtime error Execution failed:
  --> 74f67419790b956ef3aea7cf794e90632de244b0c47bc65daee728febf3f0b11:80:20
   |
80 |         let item <- self.listing.purchase(
   |                     ^

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