VBA - 将字符串定义为workheet.name而不引用

I am new to VBA and got that problem which I don't know how to fix. I have a workbook with some sheets and I create a new workbook for each sheet in that first one with the name of the sheets. That works... Now, I declare a variable of type string which defines the path to one of these new workbooks.I am new to VBA and got that problem which I do