Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2fc28e9a36d9374d3bccec5726c05f5a02e75fdf2f8093bbcf5a8b2c88a4c301:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^