Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 95073efb724ad143b4dc9c84a5e1c2a4f73498dab0b5f9ac22d244cb73bfb59a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^