Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0a31c891c5a89ccbe5b9cbe375199f039ac1fba9b20480fa4e43cdb71164ccac:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^