Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8507aad4f0b5919d1a15a0bf16baf3c53681bfea69b30c3966179e5892fba9f8:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^