Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 52ed43f29555905505c8f6fc43ea91d7864031079a44622bdda730796fd9418a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^