To resolve the "internal server error" you are encountering when trying to add classes in My Study Life, follow these steps:

1. Clear Browser Cache and Cookies:
- Open your browser settings.
- Navigate to the Privacy or Security section.
- Find the option to clear browsing data, ensuring you select both cookies and cached files.
- After clearing, restart your browser and attempt to add the classes again - learn more.

2. Check Internet Connection:
- Ensure that your device is connected to the internet.
- Try accessing other websites to confirm that your connection is stable.

3. Disable Browser Extensions:
- Temporarily disable any browser extensions or add-ons that may interfere with your web applications.
- Re-launch the browser without these extensions and check if the error persists.

4. Use a Different Browser:
- If clearing the cache doesn’t help, try accessing My Study Life using a different web browser.
- Sometimes compatibility issues can lead to server errors.

5. Check for Service Outages:
- Visit the official My Study Life support page or social media channels to see if there are any reported outages or maintenance operations.

6. Contact Support:
- If none of the above steps resolve the issue, you should reach out to My Study Life support.
- Provide them with the specific error message and any relevant details about when the error occurs to facilitate quicker assistance.

By following these steps systematically, you should be able to troubleshoot and potentially resolve the "internal server error" you are experiencing.