Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 68ead2df0f698b32733449fe861c38926a48701c06b4736273a3db50efd83592:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^