Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> cb36cc529d213ae26ecc1809bd2fff456e8a03f52157fbb0e4388a1fb5b373af:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^