c ++异常：basic_ios :: clear：iostream错误，VTKWriter

Question

我正在处理一段使用DUNE的代码。 https://www.dune-project.org/ 某些计算的数据正在使用VTKWriter写入文件。但是，运行时会抛出以下错误：

Entered constructor of deformation object: 
Filename: moving_domain_dim2_degree1_u-00000.vtu could not be opened
Exception: basic_ios::clear: iostream error
terminate called after throwing an instance of 'std::ios_base::failure[abi:cxx11]'
  what():  basic_ios::clear: iostream error
Aborted (core dumped)

VTK的背景如下：

auto stationaryVTKWriter_u = std::make_shared<Dune::SubsamplingVTKWriter<typename Geogridtype::LeafGridView>>(geogv,degree-1);

  std::string basename_u;

  basename_u =  basename + "_u";  
  Dune::VTKSequenceWriter<GeoGV> vtkwriter_u(stationaryVTKWriter_u,basename_u,"","");
  typedef Dune::PDELab::DiscreteGridFunction<FS,Vec_u> DGF_U;
  DGF_U xdgf_u(fs,x_u);
  vtkwriter_u.addVertexData(std::make_shared<Dune::PDELab::VTKGridFunctionAdapter<DGF_U> >(xdgf_u,"x_h"));

  // time loop
  NumberType time = 0.0;

  vtkwriter_u.write(time,Dune::VTK::appendedraw);

感谢任何帮助。