QOpenGLFramebufferObject: Framebuffer incomplete attachment

    QSurfaceFormat format;
    // asks for a OpenGL 3.2 debug context using the Core profile
    format.setOptions(QSurfaceFormat::DebugContext);
//    format.setDepthBufferSize(24);
//    format.setSamples(2);
//    format.setSwapBehavior(QSurfaceFormat::DoubleBuffer);
 
    TglView  w;
    w.setFormat(format);

void TglView::initFrameBuffer()
{
    QOpenGLFramebufferObjectFormat format;
    format.setAttachment(QOpenGLFramebufferObject::Depth);
    format.setInternalTextureFormat(GL_RGB);
 
    _frameBuffer = new QOpenGLFramebufferObject(_context->getViewport().size(), format);
 
    _depthTexture = new QOpenGLTexture(QOpenGLTexture::Target2D);
    _depthTexture->create();
    _depthTexture->setFormat(QOpenGLTexture::D24);
    _depthTexture->setSize(_context->getViewport().width(), _context->getViewport().height());
    _depthTexture->setMagnificationFilter(QOpenGLTexture::Nearest);
    _depthTexture->setMinificationFilter(QOpenGLTexture::Nearest);
    _depthTexture->setDepthStencilMode(QOpenGLTexture::DepthMode);
    _depthTexture->allocateStorage();
 
 
 
    _frameBuffer->bind();
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, _depthTexture->textureId(), 0);
    _frameBuffer->release();
}