Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d5ae50dcc47a98ba6700e1ca1bdabdf477bbaeddbdf209c7d85993852d6494a5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^