Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c8aaeb0d2ade7a4b6d5bcee297eaf1c46d9557476de829cf1a57f03f4815b222:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^