Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 80b38fbff5548efdbe9554ccdfe4dcf2a8d165af6125e7a3064591d0fd39f96f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^