Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 41ba5790c8ff6d411af8e812cf586b61c1172dd038f1d7015a7c8db77dc21d04:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^