Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7f8e796c81d23091f861f6ccffd4c76fa13ae78de7ef1e48b6bae66d38bd0054:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^