Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d4c742faf2c7684d978d7b1609d9631aa5f9ee666a8b05d88f387477ebeecf3d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^