Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 05943d687eb539ec2f05c41226f3befce463eaca51eb4ad14c1a8d27c8b2ada2:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^