Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5556d0531029bbef59d564f947deaeb100b28cd689bf8482de02bbe1d684ebf0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^