Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 71cf278e8d005135e671b3fe2d4901d7d25eab004644f8ee365ecb794e2cd65e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^