Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c76ba3dc85440702ef80ba19b90a0bf90fdbbdc12944becd8279eb7ca992f118:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^