Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> be4d32e2a5b1834dc6ae73401b973d6e151f02e26d9b8d59a26e62fe5730e0fd:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^