Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b61cafa790df13b483826327adbda05335b24125b1f618aac6b9af7a993994ba:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^