Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8d306eb10b4c73997eb96de4f369dbe0b56ebaf5120622273d26ad93d3a07e73:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^