Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1fc9f4f2de1bcb0b405cf0832a207a7f8d6c56e6210adff3e489c802391a5ba3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^