Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5e9a149792e1c8d77d4d7c3f07f1b7c324c2796dbbb8ebd80f50e86266b15e6e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^