Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fbb4aa5a5b707dc36ce552af48a0f2ed21176cd731dab27ad7ba3e3c9306a8ed:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^