Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 85a549176db91a1d09d810f1764752abc6d82de6f988614b8490635f99d25e67:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^