Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c6aa70f392bdc2b9bbc03e4bf53dd255cb07f8a16befd9d155cd75e73d7a13b9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^