Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4efdd546ca96fcd916e717180e71dc9f09776d9ad1705c093dea601a7c2f5ffc:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^