Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d0d6e308e8f7cb1a2f9b4456c64c91bbbb93aaaa8c0a6f0217b7f74a71c8cac9:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^