Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 05fa39a2babcbf75e80228199ce7f6b00bc32fb1f69ab06ee5dd7d597a5d7de6:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^