Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d09a3e37c506fcc718159817a7bc3c0419e877301fbf53ff4b87ce4ba3462a8e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^