Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b52ba8fce90c1db6a422ad2b7622bb0fc3e426698c8e0d6ee4ea6d7618a65aa5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^