Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8e02af863c4f0028930685ed3d1d7c682b97092823aa1fa9e5dafa7bc9619a57:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^