Error 1 an input parameter is invalid on cluster wire

I have a system with numerous subvi's, however all seems to compile ok and when I run the top level vi it seems to be working fine. However when I press a button to launch a routine that calls numerous sub vis, I get an error:
Labview: An input parameter is invalid. For example, if the input is a path, the path may contain a character not allowed by the OS such as ? or @.
The top level VI "mastercontrol2.vi" was stopped at Wire on the block diagram of "FPGASigGen_GetDataPont.vi".
[OK]
I am then taken to the block diagram of the said VI, and the section of pink cluster wire from the cluster constant is highlighted, in the section just after it enters the while loop. The top level VI then stops executing.
I have tried rebuilding this part of the code in different ways, but always with the same result. The suggested cause in the error message is clearly a red herring, because I don't do any file access anywhere.
Any help would be greatly appreciated!
Using Labview 2011 11.0
Attachments:
FPGASigGen_GetDataPoint.vi ‏42 KB

Just because you see a reference number in the probe does not mean that the reference is valid. If a parallel process closes the reference, you will still have that reference number, but the reference will become invalid. This is the usual case for an error code 1 when dealing with references.
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Build error: an input parameter is invalid

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Error 1 occurred at Open VI Reference in AB_Source_VI.lvclasspen_Reference.vi->AB_Build.lvclass:Copy_Files.vi->AB_Application.lvclass:Copy_Files.vi->AB_Build.lvclass:Build.vi->AB_EXE.lvclass:Build.vi->AB_Engine_Build.vi->AB_Build_Invoke.vi->AB_Build_Invoke.vi.ProxyCaller
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=========================
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Hi All,
I am using CAF 7.1 GP.
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Hi Experts,
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Message was edited by: Nitin Kamble

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Error 1 an input parameter is invalid on cluster wire

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