Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1af5a42e5f7b255733ffa3f5e669be5d8498dfdcc29cd811f8d6a76b00e8a752:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^