My phone keeps on giving a whatsapp error message and ask me to restore chats but when I do so all messages are not restored My phone keeps on giving whatsapp error message and asked to restore chats, but when do so not all the messages are restored
what's the error message or is just telling you to restore chats after new install?

Concerning the issue that not all chats are restored, there could be two(2) possible reasons
1. You may have deleted the chats that are "missing" or the backup file is of an earlier date before the "missing" chats
2. Whatsapp encountered 'restore time out' so it just skips them messages.
Hope this helped. Upvotes pls