Error creating customer account on prestashop 1.5.6.2

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if you cant create account on prestashop 1.5.6.2, and you see this error message :


How to fix that error on your prestashop 1.5.6.2 ?

modified AJAX request in file so it directs same place as form.
In /themes/default/authentication.tpl about line 97 there was line:

url: baseUri,
changed it to:
url: baseUri + 'index.php?controller=authentication',