After validation errors, resubmitting the registration form prints AJAX commands to screen

I am using this module for the registration and login to my site. The forms are displaying in the ctool modal.

While registering new user and enter the correct information in the form, then the form working fine but the problem occurs after resubmitting the form.

If i enter incorrect information the form displays the validation errors in form then when i try to resubmit the form it displays me a white page which has the url of http://example.com/ajax_register/login/ajax

and displaying the following content on the page and nothing else.

[ {"command":"settings", "settings":{"basePath":"\u002F", "pathPrefix":"", "ajaxPageState":{"theme":"videos", "theme_token":"uYFTHNtlWVrjdFrZEaZz9q7kqdYFsInggO_fpjyGP_s"}, "fbconnect":{"user_pictures":"allow", "language_code":"en_US", "app_id":"194519154027804", "debug":1, "connect_js":"document.location.protocol + \u0027\u002F\u002Fconnect.facebook.net\u002Fen_US\u002Fall.js\u0027", "loginout_mode":"auto", "invite_name":"ADSW", "fast_reg_mode":0, "fast_reg_autoname":0, "fbuid":0, "user":{"uid":0, "fbuid":null}}, "ajax":{"edit-submit":{"callback":"ajax_register_user_login_ajax_callback", "wrapper":"ajax-register-user-login-wrapper", "event":"click", "url":"\u002Fsystem\u002Fajax", "submit":{"_triggering_element_name":"op", "_triggering_element_value":"Log in"}}}}, "merge":true}, {"command":"modal_display", "title":"Login", "output":"\u003Cdiv id=\u0022ajax-register-user-login-wrapper\u0022\u003E\u003Cform action=\u0022\u002Fajax_register\u002Flogin\u002Fajax\u0022 method=\u0022post\u0022 id=\u0022user-login\u0022 accept-charset=\u0022UTF-8\u0022\u003E\u003Cdiv\u003E\u003Cdiv class=\u0022form-item form-type-textfield form-item-name\u0022\u003E\u000A \u003Clabel for=\u0022edit-name\u0022\u003EUsername or e-mail address \u003Cspan class=\u0022form-required\u0022 title=\u0022This field is required.\u0022\u003E*\u003C\u002Fspan\u003E\u003C\u002Flabel\u003E\u000A \u003Cinput type=\u0022text\u0022 id=\u0022edit-name\u0022 name=\u0022name\u0022 value=\u0022\u0022 size=\u002260\u0022 maxlength=\u002260\u0022 class=\u0022form-text required\u0022 \u002F\u003E\u000A\u003Cdiv class=\u0022description\u0022\u003EYou may login with either your assigned username or your e-mail address.\u003C\u002Fdiv\u003E\u000A\u003C\u002Fdiv\u003E\u000A\u003Cdiv class=\u0022form-item form-type-password form-item-pass\u0022\u003E\u000A \u003Clabel for=\u0022edit-pass\u0022\u003EPassword \u003Cspan class=\u0022form-required\u0022 title=\u0022This field is required.\u0022\u003E*\u003C\u002Fspan\u003E\u003C\u002Flabel\u003E\u000A \u003Cinput type=\u0022password\u0022 id=\u0022edit-pass\u0022 name=\u0022pass\u0022 size=\u002260\u0022 maxlength=\u0022128\u0022 class=\u0022form-text required\u0022 \u002F\u003E\u000A\u003Cdiv class=\u0022description\u0022\u003EThe password field is case sensitive.\u003C\u002Fdiv\u003E\u000A\u003C\u002Fdiv\u003E\u000A\u003Cinput type=\u0022hidden\u0022 name=\u0022form_build_id\u0022 value=\u0022form-DltUUVHw3zD2EIVADg26VYS8_HDivAMp8HhqB87kHmQ\u0022 \u002F\u003E\u000A\u003Cinput type=\u0022hidden\u0022 name=\u0022form_id\u0022 value=\u0022user_login\u0022 \u002F\u003E\u000A\u003Cdiv class=\u0022login-forgot\u0022\u003E\u003Ca href=\u0022\u002Fuser\u002Fpassword\u0022\u003ERequest new password\u003C\u002Fa\u003E\u003C\u002Fdiv\u003E\u003Cdiv class=\u0022form-actions form-wrapper\u0022 id=\u0022edit-actions\u0022\u003E\u003Cinput class=\u0022ctools-modal-ctools-ajax-register-style form-submit\u0022 type=\u0022submit\u0022 id=\u0022edit-submit\u0022 name=\u0022op\u0022 value=\u0022Log in\u0022 \u002F\u003E\u003C\u002Fdiv\u003E\u003Cdiv class=\u0027fb-connect-text\u0027\u003E\u003Cdiv class=\u0027title\u0027\u003EFACEBOOK CONNECT\u003C\u002Fdiv\u003E\u000A\u003Cp\u003E\u000AThere are many variations of passages of Lorem Ipsum available, but the majority have suffered alteration in some form, by injected humour, or randomised words which don\u0027t look even slightly believable. If you are going to use a passage of Lorem Ipsum\u000A\u003C\u002Fp\u003E\u000A\u003Ca href=\u0022https:\u002F\u002Fwww.facebook.com\u002Fdialog\u002Foauth?client_id=194519154027804\u0026amp;redirect_uri=http%3A\u002F\u002Fadsw.cactimedia.net\u002Ffboauth\u002Fconnect\u0026amp;scope=email\u0022\u003E\u003Cimg src=\u0027\u002Fsites\u002Fall\u002Fthemes\u002Fvideos\u002Fimages\u002Ffb-button.png\u0027 \u002F\u003E\u003C\u002Fa\u003E\u000A\u003C\u002Fdiv\u003E\u003C\u002Fdiv\u003E\u003C\u002Fform\u003E\u003C\u002Fdiv\u003E\u003Cscript type=\u0022text\u002Fjavascript\u0022\u003E\u000D\u000A\u0009function labelShowHide() {\u000D\u000A\u0009\u0009var field_value = jQuery(this).val();\u000D\u000A\u0009\u0009var label_element = jQuery(\u0027label[for=\u0022\u0027+jQuery(this).attr(\u0027id\u0027)+\u0027\u0022]\u0027);\u000D\u000A\u000D\u000A\u0009\u0009if(field_value == \u0022\u0022) {\u000D\u000A\u0009\u0009\u0009jQuery(label_element).show();\u000D\u000A\u0009\u0009} else {\u000D\u000A\u0009\u0009\u0009jQuery(label_element).hide();\u000D\u000A\u0009\u0009}\u000D\u000A\u0009}\u000D\u000A\u0009jQuery(document).ready(function(){\u000D\u000A\u0009\u0009jQuery(\u0022form input[type=text], form input[type=password]\u0022).bind(\u0022keyup change\u0022, labelShowHide);\u0009\u0009\u000D\u000A\u0009\u0009jQuery(\u0022form input[type=text], form input[type=password]\u0022).each(labelShowHide);\u000D\u000A\u0009});\u003C\u002Fscript\u003E"} ]