Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fcc9836530b3a4f45656bd9bd9355690d5f5767d2cd48ee8d9a86c78a86d9415:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^