If the two Excel workbooks have the same name, you cannot open them at the same time. For this, either close one of them and then open the other or change the name of one of them.

How to Compare Two Excel Spreadsheets for Duplicate Rows. Excel 2013 can locate duplicate rows as long as one column contains a unique identifier for each record, such as a product ID or account ...

In that case, VBA skips this step and continues with the next workbook. The code must skip the Personal.xlsb workbook because if it closes, it also stops running, perhaps leaving workbooks open.