Fix UnboundLocalError

✅ Solution

The UnboundLocalError usually occurs when a variable is referenced before it's assigned a value within a specific scope, often inside a conditional block. Ensure that the variable (e.g., 'field_key') is assigned a value before being used, even if it's a default value outside the conditional. Initialize the variable at the beginning of the function/block, guaranteeing it always has a defined value.