Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c154becfc3e59bcd70517ea8482fa74bc8e7bb82ee85f2743f9fbbbf6d5d1467:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^