Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 56cf1c02dd7decae55b0ad9cfbf574e7a44a3151aa41aedd1ac2f120b6a2fa85:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^