When I Change Video Resolution File Unresolved

[celilunver]

When I change video resolution succeded saving output path. But i try to run file i get File Unresolved error. And this error get some files.

Code

int fps = Convert.ToInt32(input.Metadata.VideoData.Fps > 30 ? 30 : input.Metadata.VideoData.Fps);
int yHeight = 360;
int orjWidth = Convert.ToInt32(input.Metadata.VideoData.FrameSize.Split('x')[0]);
int orjHeight = Convert.ToInt32(input.Metadata.VideoData.FrameSize.Split('x')[1]);
double yuzde = orjHeight / yHeight;
int height = yHeight;
int width = (int)(orjWidth / yuzde);

MediaToolkit.Options.ConversionOptions o = new MediaToolkit.Options.ConversionOptions
       {
              VideoFps = fps,
              CustomHeight = height,
              CustomWidth = width,
              VideoSize = MediaToolkit.Options.VideoSize.Custom
       };