Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> cb3225aea791ef4b02ee9fe4bddc1279b4a2aa7147a64cd276cbda114443e2aa:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^