Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3ddcc56bef6514eb6bc3aee19e4ac0ff581a5b38a38e34fce1080e55dbefaa41:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^