Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fd68aa2ef1801cb29127c356fe21da9dc9c4d3b5ea4fb71a0e07d0a17bc53e95:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^