Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1c405bfc6193b6cdb120162bb552310eee43b3502c9574fd34fb0c3822fb5cf0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^