Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1b7db48ffcacd0f8eb1775dfdfb87fd751f78905afef425cb6397ce75a01fe9d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^