Update of Android 5.0.1 in Galaxy Note4 always in error

[edap617]

My Galaxy Note 4 keeps on trying to update everyday the Android 5.0.1 on my Galaxy Note 4. Downloading is always successful but during installing of the update an Android image with an "error" message below the image appears. This has been going on for almost a month already. Please advise what will I do so that the OS update will proceed without any error.