Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> df7da90a8e39d640924c3fdbe4a6c501af5c1db502c3a154eb1c8d48b6205ba7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^