O que são essas linhas no meu painel de controle

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Warning: Parameter 1 to JHTMLGrid::checkedOut() expected to be a reference, value given in /home/sojoguin/public_html/libraries/joomla/html/html.php on line 87
1 Crazy Shooter Ação Atirarar e arremessar administrator 04.03.10 9 286

Warning: Parameter 1 to JHTMLGrid::access() expected to be a reference, value given in /home/sojoguin/public_html/libraries/joomla/html/html.php on line 87

Warning: Parameter 1 to JHTMLGrid::checkedOut() expected to be a reference, value given in /home/sojoguin/public_html/libraries/joomla/html/html.php on line 87
2 Lemon Smash Ação Atirarar e arremessar administrator 04.03.10 5 285

Warning: Parameter 1 to JHTMLGrid::access() expected to be a reference, value given in /home/sojoguin/public_html/libraries/joomla/html/html.php on line 87

Warning: Parameter 1 to JHTMLGrid::checkedOut() expected to be a reference, value given in /home/sojoguin/public_html/libraries/joomla/html/html.php on line 87
3 Fastfood Throwing Ação Atirarar e arremessar administrator 04.03.10 5 284

Warning: Parameter 1 to JHTMLGrid::access() expected to be a reference, value given in /home/sojoguin/public_html/libraries/joomla/html/html.php on line 87

Warning: Parameter 1 to JHTMLGrid::checkedOut() expected to be a reference, value given in /home/sojoguin/public_html/libraries/joomla/html/html.php on line 87
4 Base Defender Ação Atirarar e arremessar administrator 04.03.10 4 283

Warning: Parameter 1 to JHTMLGrid::access() expected to be a reference, value given in /home/sojoguin/public_html/libraries/joomla/html/html.php on line 87

Warning: Parameter 1 to JHTMLGrid::checkedOut() expected to be a reference, value given in /home/sojoguin/public_html/libraries/joomla/html/html.php on line 87
5 Crusader Tank Ação Atirarar e arremessar administrator 04.03.10 4 282

Warning: Parameter 1 to JHTMLGrid::access() expected to be a reference, value given in /home/sojoguin/public_html/libraries/joomla/html/html.php on line 87

Estão aparecendo essa linhas quando abro o paine de controle na aba administrar artigos, isso começou depois que instalei o swMenuFree, o que pode ser e como corrigir?
Obrigado