cant build

[MartinB]

LabVIEW Data\Robot Project Final\Autonomous Iterative.vi

Invoke Node in AB_Source_VI.lvclass:Close_Reference.vi->AB_Build.lvclass:Copy_Files.vi->AB_Application.lvclass:Copy_Files.vi->AB_Build.lvclass:Build.vi->AB_RTEXE.lvclass:Build.vi->AB_Build.lvclass:Build_from_Wizard.vi->AB_UI_FRAMEWORK.vi->AB_Item_OnDoProperties.vi->AB_Item_OnDoProperties.vi.ProxyCaller
<APPEND>
Method Name: <b>Save:Target Instrument</b>
Details:
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Error 1502 occurred at AB_Source_VI.lvclass:Close_Reference.vi -> AB_Build.lvclass:Copy_Files.vi -> AB_Application.lvclass:Copy_Files.vi -> AB_Build.lvclass:Build.vi -> AB_RTEXE.lvclass:Build.vi -> AB_Build.lvclass:Build_from_Wizard.vi -> AB_UI_FRAMEWORK.vi -> AB_Item_OnDoProperties.vi -> AB_Item_OnDoProperties.vi.ProxyCaller

Possible reason(s):

LabVIEW: Cannot save a bad VI without its block diagram.

Please help we can not build the code to the crio.