Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> cd64aabd0e90a4331d2f474947a6fc0045da29d21b71aa8b4400ad0e0d7ae82e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^