Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7d85e432ccbe3f12f2031dc64dba25947edb87f753acdf81c7d0443d2e22f929:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^