Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e96b5400584e561f1dcbe86a9991be2a90dc7a09a380c5c2f5a79b2e877d65c1:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^