Hi there! It sounds like you're having trouble adding a hyperlink in Excel. The error message you're seeing is likely due to some restrictions on your computer that are preventing you from accessing the link. Here are a few things you can try to resolve the issue:

1. Check your computer's security settings: It's possible that your computer's security settings are preventing you from accessing the link. Try adjusting your settings to allow for hyperlink access. You may need to contact your system administrator for assistance with this.
2. Try a different browser: If you're using a web browser to access the hyperlink, try using a different browser to see if that resolves the issue. Sometimes certain browsers can have restrictions that prevent hyperlink access.
3. Use a different method to add the hyperlink: Instead of clicking on the hyperlink icon in Excel, try typing out the hyperlink directly into a cell. To do this, simply type out the full URL (including the "http://" or "https://") and press enter. The cell should automatically turn into a clickable hyperlink.

I hope one of these solutions works for you! Let me know if you have any other questions.

Example of Excel formula using [code] tag: