The getter ‘path’ was called on null.

The error means that the object for which you are writing object.path is null. You can use ?. operator like this: object?.something which is equivalent to:

object!=null ? object.something : null

When I pass pdf URL value to this its getting error with the built-in keyword “path” and it seems to be null?

loadPdf(String pdfPath) async {
    setState(() => _isLoading = true);

    var fileName = pdfPath.split('/').last;
    
    var localFileUrl = (await Directory(CacheManager.getInstance().appDocumentDir.path +'/'+"realpro"+"/").create(recursive: true)).path +fileName;
    
    if (await CacheManager.getInstance().checkFileExist(localFileUrl)) {
      document = await PDFDocument.fromAsset(localFileUrl);
      print(document);
      setState(() {
        _isLoading = false;
      });
    } else {
      document = await PDFDocument.fromURL(pdfPath);
      print(document);
      setState(() {
        _isLoading = false;
      });
    }
}