Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fe0c88094ce2b46080b0f4550756689c7c6c8535d4602daa52d5159d9d9ab99d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^