Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4994a85aaeff32bf50eff1faa27d3f57ba5a4997c8147df250774b3e53289c3a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^