Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8d1e178a3e2464ef2606ded1bef7cb0617f7385c7258c2afcac0e0657a8de8c0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^