Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1dcbbe4b062a9200bf8e80faeb31633bfd476cebf92baf630e1cfeb954a7f498:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^