Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 32f489bac4cc6e45c1685c5033532fb4a6d6e48c44fecc85ee6d1e8a10d4570f:16:28
   |
16 |                             let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^