Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 05c231f6be3dbfd13612c8c4cd29ec6a0fcab3b16ed6fc3c3c00b8369733dbed:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^