Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 00f021827d0b68ac2e1a90bfcfa5b1e8ad8766032b821c0f88e8661f98be7a6e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^