In resolving similar issues, I found it useful to thoroughly check that variable names are consistent between the controller and Blade templates. The error related to ‘design_info’ not being passed indicates that the data might not be correctly set in the controller or may be missing in the array of variables sent to the view. Ensuring that the variable is properly defined and included in the data array can resolve this issue. Additionally, review all includes and view components to confirm they expect the correct variable names, thereby preventing mismatches.