Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8f5a66e9f1a202f5886c83c9ef552857d6a9b7f1dd6a531341749fb68b878f4e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^