Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> af9fbfe5ad66e1ae9acd1d20406be30ef28e905bdfff2e7849be09ca38399a4e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^