Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> da5bde437a76f7f73b1c15dee4d88c4e4c786f0a7b8b9b88e1b489cda1c1c53b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^