Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8f408bf0a744202f57579af82ff4ad667d25db124021971726d9ee7c011b797d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^