Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 781cc41083ad10efb814677401a55ea7895f757a7df6a0045ce3a6f4d0a39d7e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^