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MP4 video error

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I transfer videos(each one with a different format to check if the mp4 really support all formats listed on the manual) from my PC to my mp4 . I open my removable disk files folder and all of them were listed so I went to the video menu on the mp4 and just one was listed(The one with the a v I format) but the warning 'File folder error' appears when I try to watch the video. I went back to my PC removable disk files and open the same video,no image was showed but there is the sound of the video! What setting or step am I doing wrong? Many thanks for any advice