Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7d0b00eb0a3ffcf5c5c247f5f3f965ffc473d5b2a6c9ade1f934c44dee7c42a7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^