Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 26d1e59bbab78db44dff7845b61bb6cad33aaddc07f4f0fbbfdc8815c30bbece:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^