# Issue compiling custom reader plugin with accompanying VTK reader
**URL:** https://discourse.paraview.org/t/issue-compiling-custom-reader-plugin-with-accompanying-vtk-reader/5286
**Category:** Development
**Created:** [September 7, 2020, 2:20pm UTC](https://discourse.paraview.org/t/issue-compiling-custom-reader-plugin-with-accompanying-vtk-reader/5286 "2020-09-07T14:20:27Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@mdjong](https://discourse.paraview.org/u/mdjong)
#### Post date: [September 7, 2020, 2:20pm UTC](https://discourse.paraview.org/t/issue-compiling-custom-reader-plugin-with-accompanying-vtk-reader/5286/1 "2020-09-07T14:20:27Z")
Hey guys,
I’m currently trying to create a reader for the JSON based CityJSON format (mix of CityGML and GeoJSON ([www.cityjson.org](http://www.cityjson.org))).
As far as I understand I will need to create a new VTK reader to accompany the ParaView plugin, so I’m using the [ElevationFilter](https://discourse.paraview.org/t/creating-custom-paraview-reader/5027) as an example. Running into a few issues however, so was hoping someone could help:
When I try to compile I run into the following error:
```auto
In file included from /mnt/hdd/Repositories/Paraview-CityJSONReader/Plugin/CityJSONReaders/vtkMyCityJSONReader.cxx:1:
/mnt/hdd/Repositories/Paraview-CityJSONReader/Plugin/CityJSONReaders/vtkMyCityJSONReader.h:6:49: error: expected initializer before ‘:’ token
6 | class CITYJSONREADER_EXPORT vtkMyCityJSONReader : public vtkPolyData
|
```
The code I have so far is:
vtkMyCityJSONReader.cxx
```auto
#include "vtkMyCityJSONReader.h"
#include "vtkObjectFactory.h"
vtkStandardNewMacro(vtkMyCityJSONReader);
//----------------------------------------------------------------------------
vtkMyCityJSONReader::vtkMyCityJSONReader()
{
}
//----------------------------------------------------------------------------
vtkMyCityJSONReader::~vtkMyCityJSONReader()
{
}
//----------------------------------------------------------------------------
void vtkMyCityJSONReader::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
```
vtkMyCityJSONReader.h
```auto
#ifndef vtkMyCityJSONReader_h
#define vtkMyCityJSONReader_h
#include "vtkPolyData.h"
class CITYJSONREADER_EXPORT vtkMyCityJSONReader : public vtkPolyData
{
public:
static vtkMyCityJSONReader* New();
vtkTypeMacro(vtkMyCityJSONReader, vtkPolyData);
void PrintSelf(ostream& os, vtkIndent indent) override;
protected:
vtkMyCityJSONReader();
~vtkMyCityJSONReader();
private:
vtkMyCityJSONReader(const vtkMyCityJSONReader&) = delete;
void operator=(const vtkMyCityJSONReader&) = delete;
};
#endif
```
CMakeLists.txt
```auto
cmake_minimum_required(VERSION 3.8)
project(CityJSONReader)
find_package(ParaView REQUIRED)
option(BUILD_SHARED_LIBS "Build shared libraries" ON)
enable_testing()
# Required for python testing
set(_vtk_build_TEST_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/Testing/Temporary)
include(GNUInstallDirs)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR}")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR}")
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR}")
set("_paraview_plugin_default_${CMAKE_PROJECT_NAME}" ON)
paraview_plugin_scan(
PLUGIN_FILES "${CMAKE_CURRENT_SOURCE_DIR}/Plugin/paraview.plugin"
PROVIDES_PLUGINS plugins
REQUIRES_MODULES required_modules)
foreach (module IN LISTS required_modules)
if (NOT TARGET "${module}")
message(#FATAL_ERROR
"Skipping example ${CMAKE_PROJECT_NAME}: Missing required module: "
"${module}")
return ()
endif ()
endforeach ()
paraview_plugin_build(
RUNTIME_DESTINATION "${CMAKE_INSTALL_BINDIR}"
LIBRARY_DESTINATION "${CMAKE_INSTALL_LIBDIR}"
LIBRARY_SUBDIRECTORY "${PARAVIEW_PLUGIN_SUBDIR}"
PLUGINS ${plugins})
```
---
### Author:  [@danlipsa](https://discourse.paraview.org/u/danlipsa)
#### Post date: [September 7, 2020, 3:29pm UTC](https://discourse.paraview.org/t/issue-compiling-custom-reader-plugin-with-accompanying-vtk-reader/5286/2 "2020-09-07T15:29:54Z")
I would take a look at the CityGML reader
[https://blog.kitware.com/citygml-reader/](https://blog.kitware.com/citygml-reader/)
and integrate it in ParaView the same way first. When you get that working, you can make the code a ParaView plugin as a separate step.
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [September 7, 2020, 3:31pm UTC](https://discourse.paraview.org/t/issue-compiling-custom-reader-plugin-with-accompanying-vtk-reader/5286/3 "2020-09-07T15:31:46Z")
`#include "YourModuleName.h" // for export macro`
is missing.
---
### Author:  [@mdjong](https://discourse.paraview.org/u/mdjong)
#### Post date: [September 7, 2020, 3:44pm UTC](https://discourse.paraview.org/t/issue-compiling-custom-reader-plugin-with-accompanying-vtk-reader/5286/4 "2020-09-07T15:44:59Z")
Thanks Mathieu, I was just wondering what ‘YourModuleName’ is going to end up being, because in the examples I see “vtkIOGeoJSONModule” for the module “vtkGeoJSONReader”, but am unable to actually find the header file that is being referenced. How is this include chosen?
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [September 7, 2020, 3:51pm UTC](https://discourse.paraview.org/t/issue-compiling-custom-reader-plugin-with-accompanying-vtk-reader/5286/5 "2020-09-07T15:51:33Z")
it is coming from the vtk.module file alongside your vtkMyCityJSONReader.cxx.
---
### Author:  [@mdjong](https://discourse.paraview.org/u/mdjong)
#### Post date: [September 7, 2020, 6:19pm UTC](https://discourse.paraview.org/t/issue-compiling-custom-reader-plugin-with-accompanying-vtk-reader/5286/6 "2020-09-07T18:19:28Z")
Great, thanks Mathieu, I have a module that’s compiling now, so that’s awesome
Must be a few hurdles still on the way, but at least this brings me some steps closer!