Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 969a227095d1e875526c98fea3fc1f68945ee112b04660863c5c63a97f386751:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^