Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1f6fc0bcf01619c2a4c92406d851dea963d8f8b7afe01df9e5a6952c6d1698b2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^