Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ac9639008cee11fe8870b2f5b54ab8514b27e30235a0ae40f7ef0461e417ba7c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^