Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1af3f31a3a85f4ad555bc9d1f2f7afae264362675e9879f67118344cd2c5bace:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^