Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a9937e2e61d5b7de4e7a0d765b6fad9c7fae68d4976eed3b2fe0afaa78c4406a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^