Save new mat file: MATLAB

Hello,
I am not able to save a new MATLAB file (ie. create a file) from LabVIEW . This is possible in MATLAB by using the command: save(filename, 'variable'). When I do this in LabVIEW for a new file, I get a message saying that the file does not exist. This does not happen in MATLAB. How do I get around this? In my program I need to create many mat files with data collected while LABVEIW is running.
I would appreciate any incite in this matter,
Thanks,
Ivanka

Here is a sub vi. Please let me know if you need more clarification. Thanks,Ivanka
Attachments:
case 12 write LANDMARKS.vi ‏27 KB

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