Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ad0b3cba05bfa82ccfe3d3066d076a715ca5b56b671ff57a2e4306b7ced67fe1:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^