This LabVIEW class cannot find its parent class.

[LVB]

I have encoutered this error a few times recently.  Clearing the compiled object cache fixed it once.  Place the following in a batch file and run when LabVIEW is closed:

rmdir /S /Q "C:\Users\bfischer\Documents\LabVIEW Data\VIObjCache"

rmdir /S /Q "C:\Program Files (x86)\National Instruments\LabVIEW 2013\VIObjCache"

PAUSE

[AristosQueue (NI)]

LVB wrote:

I have encoutered this error a few times recently.  Clearing the compiled object cache fixed it once.

That was mind boggling to me -- I couldn't see how those two features (compile cache and a class finding its parent) were connected -- so I pinged the dev team. Sure enough... someone just worked on a 2013 bug where building a packed project library would cause app builder to overwrite the compile cache instead of creating its own cache. Clearing the cache is the known workaround. It is tagged to be included in 2013 SP1. CAR 413336.