Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 531bd1052de83d46c81023a49be59cf0781ac7ecbf46d41d5af61364878ddeac:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^