Windows Forms OpenFileDialog and LibVLC plugins dll entry point error - winforms

Question

I'm using libvlc library. And it works well when I play the video file, that I have chosen in openFileDialog previously. But my goal is streaming video from webcam and previewing it.
I made libvlc show webcam video on the screen, but when i commented out the openFileDialog.Show() line (that I don't need anymore), "Entry point couldn't be found in the library" error dialogs started poping out for every libvlc plugin (that is basicaly a .dll file).
private void btPlay_Click(object sender, EventArgs e)
{
/*
if (openFileDialog1.ShowDialog() != System.Windows.Forms.DialogResult.OK)
return;
* */
CleanUp();
string pluginPath = Path.Combine(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location), "plugins");
string[] args = new string[]{
"--no-qt-error-dialogs",
"--ignore-config",
"--quiet",
"--plugin-path=" + pluginPath
};
//LibVlc initialization, that is where ERORR OCCURES
vlcInst = new VlcInstance(args);
/* Input media settings */
//VlcMedia media = new VlcMedia(vlcInst, openFileDialog1.FileName);
VlcMedia media = new VlcMedia(vlcInst, "dshow://");
LibVlc.libvlc_media_add_option(media.handle, "dshow-vdev=USB2.0 UVC VGA WebCam");
LibVlc.libvlc_media_add_option(media.handle, "dshow-adev=none");
/* Output media settings */
string[] outputOptions = new string[] {
"sout=#duplicate{",
"dst=",
"display",
",",
"dst=",
"'",
"transcode{vcodec=h264,acodec=mpga,ab=128,channels=2,samplerate=44100}",
":http{mux=ffmpeg{mux=flv},dst=:666/}",
"'",
"}"
};
LibVlc.libvlc_media_add_option(media.handle, String.Concat(outputOptions));
streamer = new VlcStreamer(media);
media.Dispose();
streamer.Drawable = mediaPanel.Handle;
streamer.Play();
}
private void CleanUp()
{
if (streamer != null)
{
streamer.Stop();
streamer.Dispose();
}
}
I can't see any relations between OpenFileDialog and libvlc plugins.
What can cause such a problem?
EDITED:
After I skip all error dialogs, program continues working.

Answer 1

When I was using VLC player, it made duplicates of the plugins in "plugin" folder. In my app I used those plugins and was getting errors. After I downloaded and unpacked new instance of the player, I discovered that there were no duplicates of the plugins, so I made a conclusion that the player makes copies of plugins when you launch it first time (didn't test it).
When I replaced my plugin folder with new one, all the errors were gone.