Error 2 occurred at C:\Program Files (x86)\National Instruments\LabVIEW 2012\vi.lib\addons\LabJack\ljackuw.llb\EAnalogOut.vi

I keep getting an error about memory being full on the EanalogOut icon-->

Error 2 occurred at C:\Program Files (x86)\National Instruments\LabVIEW 2012\vi.lib\addons\LabJack\ljackuw.llb\EAnalogOut.vi

LabVIEW:  Memory is full.
=========================
NI-488:  No Listeners on the GPIB.

I'm fairly new to LabView so a detailed explanation about this problem and how to fix it would be greatly appreciated.

I'm collecting sulfur dioxide concentration data in a simple spreadsheet and writing it to a file. I would also like to know how to write a header for the column of data that I'm collecting. I've attached my VI that I've written.

Thanks in advance!