Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b31afdf9b3bfbea1e2502372d7c82d86e8bc25c8d5a5e2445bd0ffb27d450b85:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^