Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7cb60108aa93ed7dbf9c3a86c369bb252d75e9021cda7bf7bbb11306a8aa9e34:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^