Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d3f20e7c4ac0f8010ae96ed827e80b1dba096bad7dd209c68a1a31cd8bb51852:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^