The Code Conversion Utility could not set the base class because the class being converted has a parent class that was not found. The Code Conversion Utility changed the base class to LabVIEW Object.
Confirm that the file exists at the location specified. Consider mass compiling your files before using the Code Conversion Utility to ensure all file references are correct. You can convert the base class and change the base class of the child to reference the converted base class, or you can reconvert the class hierarchy.