Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7b4d6a236bc9e1acb2d4b3ec9fd342c02d763b4db806b817c46ffd389801cfff:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^