Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c28ee0df09e0591aef082683db02eea7b496b64341bd7a6e43cff4a29e8bc09f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^