Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ca2a1e9d1a0c6e2965f56e7f4beeb1de7df03e45f98c1d1054896bd7e8649a41:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^