Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d23a07ede62f67eb6558b48f51dbb12fdb73a4f826f421c174c5c39fdb7d3ceb:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^