Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d681a840c94c24a1e76bdf89012b0aee6bfb1cbc508e9f009bbb413dcf9264aa:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^