Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9f1ab47a5c4dab6032f6d2c413855a206e8c4aea0a8c65c2e17fad74e50e7b52:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^