Analogue Output from Numeric Value

I have a VI which converts a digital signal into a speed based on the number of pulses per revolution. What I would like to do is now output that numeric value as a scaled 0-5V channel. I have tried to use the DAQassistant as with all of my other analogue outputs but it gives a buffer error. I know it can't be that hard to implement, can someone point me in the right direction...
Thanks,
Richard

Thanks
Files are attached save under version 11.0/
Attachments:
MeasureFreqandGraphSpeed.vi ‏13 KB
ObtainSpeed.vi ‏23 KB

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*     SimpleAudioRecorder.java
*     This file is part of jsresources.org
* Copyright (c) 1999 - 2003 by Matthias Pfisterer
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* - Redistributions of source code must retain the above copyright notice,
*   this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
*   notice, this list of conditions and the following disclaimer in the
*   documentation and/or other materials provided with the distribution.
|<---            this code is formatted to fit into 80 columns             --->|
import java.io.IOException;
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