Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 876b3c174c1f7e08f8fa4c9d198c1f35962221b4279a6efaf5db1bba23eb22e0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^