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please be aware of 3rd party template override. to make full width I made the changes at:
/templates/ja_social_ii/html/com_community/layouts/register/profile.php, line 32
<div class="col-md-6">
changing it to
<div class="col-md-12">
and please contact JA social template provider about they compability with jomsocial 4.2.2
my suggestion please goto jomsocial backend > configuration > templates, and select "jomsocial" as jomsocial template.
I'm not sure JA social template that are you using now will always updated with jomsocial latest version.
sorry, but I did a testing after I made the changes. and not got that error page. not sure why you got that error page.
it's okay if /templates/ja_social_ii/html/com_community/layouts/register/profile.php deleted, because that only override file.
my suggestion, please goto jomsocial backend > configuration > templates, and select jomsocial at default jomsocial template.
because 3rd party template not 100% uptodate