Unknow modifier

Found the problem.

I had in textboxes choice options a “/”. Just removed it and error disappear! I supposed it was read as RegEx instruction.

ref.: https://wpml.org/forums/topic/profile-fields-translation/

I fix it without change the option’s text.

Just modified row 192 in file class.xprofile.php with:

$name = str_replace("/", "\/", $option->name);
return preg_replace( "/\>{$name}\<\/label\>/", ">{$label}</label>", $html, 1 );