Error message on joomla website

IN PROGRESS
Bids
3
Avg Bid (CAD)
$30
Project Budget (CAD)
$30 - $250

Project Description:
Hi, Need to fix error message on joomla website:

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

Budget $25

Skills required:
Joomla
About the employer:
Verified
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