Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 424cfacd576ae05e91a2c11bac62239181b01f7ab8526b3f015f7d8c6af2522d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^