Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d3ad510afc369db04fe30e79f6619833519a6fa381d7df4b3d2543721dcf8e20:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^