Error message

• Strict warning: Declaration of csl_names::render() should be compatible with csl_rendering_element::render($data, $mode = NULL) in module_load_include() (line 330 of /home/scientia/domains/scientiasocialis.lt/public_html/ppc/includes/module.inc).
• Strict warning: Declaration of csl_date::render() should be compatible with csl_rendering_element::render($data, $mode = NULL) in module_load_include() (line 330 of /home/scientia/domains/scientiasocialis.lt/public_html/ppc/includes/module.inc).
• Strict warning: Declaration of csl_date_part::render() should be compatible with csl_rendering_element::render($data, $mode = NULL) in module_load_include() (line 330 of /home/scientia/domains/scientiasocialis.lt/public_html/ppc/includes/module.inc).
• Strict warning: Declaration of csl_number::render() should be compatible with csl_rendering_element::render($data, $mode = NULL) in module_load_include() (line 330 of /home/scientia/domains/scientiasocialis.lt/public_html/ppc/includes/module.inc).
• Strict warning: Declaration of csl_group::render() should be compatible with csl_rendering_element::render($data, $mode = NULL) in module_load_include() (line 330 of /home/scientia/domains/scientiasocialis.lt/public_html/ppc/includes/module.inc).
• Strict warning: Declaration of csl_layout::render() should be compatible with csl_rendering_element::render($data, $mode = NULL) in module_load_include() (line 330 of /home/scientia/domains/scientiasocialis.lt/public_html/ppc/includes/module.inc).
• Strict warning: Only variables should be passed by reference in theme_biblio_tabular() (line 276 of /home/scientia/domains/scientiasocialis.lt/public_html/ppc/modules/biblio/includes/biblio_theme.inc).