Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d97f4e53747bd9ec44a7f287c3a4d463ec49bf871d55b9f2efdcc293eb30a6d2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^