Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> bb9e4dbb09c9489f4f7054cc05e2b0e92338dc681df1126543c8dcb4d1f275d1:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^