How to solve "can't add sticker pack to WhatsApp Plus"
Why is the message shown ?
There is a bug in Android system that it doesn't handle the sticker permission well, so you may need to reinstall WhatsApp Plus to grant the sticker permission to Android system again.
How to slove the problem ?
1. Download WhatsApp Plus
2. Install WhatsApp Plus
p.s. Uninstall the existing WhatsApp Plus if install failed
3. After reinstall successfully, add sticker pack to WhatsApp Plus again
4. Enjoy your stickers !
Is there a virus in WhatsApp Plus ?
No, HeyMods team promises there is no any virus / spyware or malicious code in WhatsApp Plus by HeyMods Team. The WhatsApp Plus apk is scanned and passed by 58 virus scanner with 0 virus detected.
Check this link to find out the scan result : Virustotal Scan Report