Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> cf180257b71c0ea2ef05a2c7aa95e1cc3d20c1bc97bf43124770c2b0bdeca416:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^