Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 13a7506cfdafe39aac856d8ce89274809bf6075dd9b692c3169dc1aed0d9fe55:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^