Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e83daba75d38ea8fc803b5f4970fd86d9e676f1f2a8ea04c79e062a0f8b55db2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^