Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> bb698d7b8265b87d6d5b3a448a5871f2a59b6e86f2acaca7ba24a38b77adfb74:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^