Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 34fdccc5e06ce94d5ac31657898c9f6e5f5c03db755aeafbb8fd959fea4d0e31:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^