Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 10a623dfacf6139f7a763aa9d17247e26437dfc9cfa2ac163e5bf8680ce7dbc5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^