Error message

• Deprecated function: Optional parameter $js declared before required parameter $element is implicitly treated as a required parameter in include_once() (line 1445 of /var/www/html/mathtube.org/includes/bootstrap.inc).
• Deprecated function: Optional parameter $input declared before required parameter $form_state is implicitly treated as a required parameter in include_once() (line 1445 of /var/www/html/mathtube.org/includes/bootstrap.inc).
• Deprecated function: Using ${var} in strings is deprecated, use {$var} instead in include_once() (line 1065 of /var/www/html/mathtube.org/includes/theme.inc).
• Deprecated function: Using ${var} in strings is deprecated, use {$var} instead in include_once() (line 1065 of /var/www/html/mathtube.org/includes/theme.inc).
• Deprecated function: Using ${var} in strings is deprecated, use {$var} instead in include_once() (line 1065 of /var/www/html/mathtube.org/includes/theme.inc).
• Deprecated function: Using ${var} in strings is deprecated, use {$var} instead in include_once() (line 1065 of /var/www/html/mathtube.org/includes/theme.inc).