How to solve "can't add sticker pack to YoWhatsApp"
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 YoWhatsApp to grant the sticker permission to Android system again.
How to slove the problem ?
1. Download YoWhatsApp
2. Install YoWhatsApp
p.s. Uninstall the existing YoWhatsApp if install failed
3. After reinstall successfully, add sticker pack to YoWhatsApp again
4. Enjoy your stickers !
Is there a virus in YoWhatsApp ?
No, HeyMods team promises there is no any virus / spyware or malicious code in YoWhatsApp by HeyMods Team. The YoWhatsApp 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