Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9950472efad0ba319d395bf391a1e68f9845d68a17484d2432cd185b24834584:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^