Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> ced08c9f28cdb7d1ec7bffe2f6f97a42e6d0b4bc09ac1c8a1e8876decc6d4805:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^