Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6090b9b0c7f4e4704cc84b975f0db55e759abea67f46f40ab0aafe5ba8b2bac4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^