Hello chathurika178 and welcome to Apple Support Communities,
If we understand your post correctly, you're seeing a verification error that you've been unable to dismiss the error. We’d like to help.
We see you were viewing "Get help with security issues - Apple Support" and it did not resolve your issue.
Starting in safe mode may allow you to dismiss the error message. If you're unfamiliar with safe mode this article can help:
Use safe mode on your Mac - Apple Support
Let us know if that resolves this issue for you.
Thanks for using the Apple Support Communities.