Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c5d73fbd3b6d4b415483a275d6b87a21fd9efe15ab77f2f71e3c51c3fbd6faf3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^