Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d81b2092b8050e1955df5aaa8fa740381bfa1137fcca3354ad5e604ec1ee7cd5:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^