when I click one of the following similar subjects, an error message appears.

Hello Munir1,

Welcome back to the Community. It's important you're able to navigate the program without experiencing error messages. Rest assured, I'll be happy to assist you so you can get back to doing what you enjoy. 

Based on the details you've provided above, I suspect this may be a browser-related issue that's causing the discrepancy you're experiencing. Clearing cache and cookies helps with fixing most browser issues. You can do this by following the steps in this article: Clear Cache and Cookies. Let me know if there are error numbers appearing on your screen as this may require a different type of troubleshooting based on the error number. 

Give this a try and let me know what happens. I'll be here in case you have other questions.