Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 30548e599985cb7926536d783b00137ecf5b5e19323045450704467e3dd6c131:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^