Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6a77ee4d1c3f1c6fd4d51df8c7bcdacd1daaa8994c4f0bf4d527ba5520642476:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^