Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f36395835986bbd2adefa395fd89511c35581c8366fb9c2b4bf8c94cfbf9fd97:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^