Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3d38888e1354ed0a7eb3b712bbc461b2e6549c2acf8f5cdbd8d0f2bd33878d15:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^