While accessing your Moodle course page, you may face the issue where the browser shows the following error:
...
The error can be fixed just by clearing the cache of your browser.
Instructions:
How to clear the cache on Chrome:
Step 1 - On your computer, open Chrome 
.
Step 2 - At the top right, click More.
Step 3 - Click More tools Clear browsing data.
Step 4 - At the top, choose a time range. To delete everything, select All time.
Step 5 - Next to "Cookies and other site data" and "Cached images and files," check the boxes.
Step 6 - Click Clear data.
How to clear the cache on Edge:
Step 1 - Open Microsoft Edge, select Menu (3 dots icon on the top right corner of the browser) > Settings > Privacy & services.
Step 2 - Under Clear browsing data, select Choose what to clear.
Step 3 - Select "Cached images and files" and "Cookies and other site data" check box and then select Clear.