Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4f4306e3dbfaa15c855093d11ddd7a3de0ce21537db080627c18f1a9858aa157:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^