Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 72c952bc73571db3f8823b356c4d8230e3510d6139b2f21616f741046a394c42:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^