My first Magento install on localhost producing errors in admin area

[sandra_sailer]

Turns out this worked (the thread in stack exchange)!  And I didn't have to upgrade my version of PHP.  Now, I just need to learn how to use it!    Thank you for all of your help!

I can't post the code that actually worked (the forum didn't like the HTML), but it was the last one in the thread.

Thank you!

[Vimal Kumar]

Could you share the stack link which worked for you or it is same which I shared with you?

[sandra_sailer]

Yes, it's the stack exchange link that you shared with me.  The last solution suggested worked.  However, how my menu items aren't working.  I know from videos that there is supposed to be a flyout menu, but nothing happens when I click the links.

Thanks.

[sandra_sailer]

I replaced this line of code, and now the icons are visible and the main link works, but no flyout menu:

<item name="view_preprocessed" xsi:type="object">Magento\Framework\App\View\Asset\MaterializationStrategy\Symlink</item>
Replace To
<item name="view_preprocessed" xsi:type="object">Magento\Framework\App\View\Asset\MaterializationStrategy\Copy</item>

[sandra_sailer]

I found a threat that fixed this:

https://community.magento.com/t5/Magento-2-x-Technical-Issues/One-or-more-indexers-are-invalid-Make-...