Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f98deac2c47b583d70a102dbf98d6c2809964b61d2fdb30fef08bf630cee3c32:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^