error code 1430 when I run an labview exe from a script

Hello,

I am running labview exe from a perl script. I am actually measuing the signal measurements from the oscilloscope and then writing that data into an excel sheet. Using the perl script I am getting the directory for creating the excel sheet and write down the measurements. When I run the script and the application is called I get an error saying Error 1430,Open/Create/replace file . Write to spread sheet.vi and Possible reason 

Error 1430: The path is empty or relative. You must use an absolute path.

Can anyone help me get an understanding of this error.

Thanks

Bharath