Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f22dfe39167051ec2767dd7e1513d5f3dc33d270b8bd4db4ee0cba96339158ef:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^