Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4778c42bffee23469b488b461218dcbe1f364ef79f0b1e32214cbcbf3cfb8319:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^