Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c1eaba6c0ff5d2f8edbc985a724d43248535a8ddf9e570d150ddf766e4c8df1e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^