Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6ecb395821ce89f69048e2e7ff5038c68d7c6b9f106fb461ee99e878fb246322:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^