Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f6105be37da0b7eb3cda4c9e20a3ef758cfee113638e57fb448237b171eaa07c:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^