Build path from string control

Question

Does anyone know why when I Use a string constant fed into a build path function my vi creates the file properly but when I change it to a control so that I can input a number to the file name I get error 1059 unexpected file type?
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Answer 1

I'm trying to write to a file each time I update data. Everything was working fine until i realized that each time I stop excecution and start back up I lose all data if I replace it again so I wanted to be able to add a new number of my choosing each time to the file name but keep the full base name. I also wanted it to save in a base location while creating a new folder for each month and each day. If i a string control and concatenate it the error comes from the open/create/replace function but doesn't come up when I use a string constant.
The first picture is my vi and the 2nd is the sub vi used to create the folder if it doesn't exist
Attachments:
File Saver 1.jpg ‏45 KB
File Saver 2.jpg ‏58 KB