Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> dffc4e74dbb529a3d88c8f2b27eb0fdca72ac499ff4904ea3bdf907cecfd78ea:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^