Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 609a974d3d2364d2fd05aeb27e1a1e6d8a34e64d3f9f3a76a41d8a039a569b1e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^