Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5b0b8a4c26f5c0f8c33f2a8bf8af2cbe9640d66126a702f0e12ce3014b46866e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^