Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b9e1686b3e3869e97d0f16bd3cf632c36b011872bfb5e2f95d9bf1b8c5421151:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^