Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b047a9bafd14d91a46a0bd6f5cb3947b4e326e313002059e1dfebd54ed2db485:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^