Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 865e03733b91cc62e63438b4cf2f6cb0f54c9d3efbdcb9821990c835464e9a7d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^