QApplication + cv::viz::Mesh::load: Parsing error

I'm trying to load an .obj file using cv::viz::Mesh::load method as follows: cv::viz::Mesh::load(filename, 2); It works fine, but if I call the same method after initializing a QApplication like so: QApplication app(argc, argv); cv::viz::Mesh::load(filename, 2); I get the following error: > ERROR: In> /home/zsn/Documents/VTK-6.3.0/IO/Geometry/vtkOBJReader.cxx,> line 193 vtkOBJReader (0xf501a0):> Error reading 'v' at line 2 Does anyone know how to resolve it?