Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d0af4a664c1e9258ec9685b7b7d18a7c02a40a08ae30857cd5fb3bcf84b9b2c8:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^