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Are you getting these errors in Joomla?

Warning: Parameter 1 to modMainMenuHelper::buildXML() expected to be a reference, value given in /home/xx/public_html/libraries/joomla/cache/handler/callback.php on line 99

or

Warning: Parameter 1 to HTML_content::show() expected to be a reference, value given in /home/xx/public_html/travel/includes/Cache/Lite/Function.php on line 92

Its because Joomla does not support PHP 5.3 or PHP 5.3.1

Just downgrade your PHP version and these errors will go away

Are you getting the following error while updating any package in pear?

pear.php.net is using a unsupported protocal – This should never happen.

I got this error right after I upgraded PHP from 5.2 to 5.9 (using CentOS-Testing repo). To resolve this situation, do this.

rm -fr /usr/share/pear/.channels

and then do this

pear update-channels

It should now give you the following output

Updating channel "doc.php.net"
Update of Channel "doc.php.net" succeeded
Updating channel "pear.php.net"
Update of Channel "pear.php.net" succeeded
Updating channel "pecl.php.net"
Update of Channel "pecl.php.net" succeeded

That’s it, your issue is resolved.