Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7e168f7fd5c0d6956f70fa8b90be21dfb68392e991624a6eb45f2c7e0a069a2f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^