vb.org Archive - Logging in issues

hi guys. ive recently downloaded the following style for V4:
https://vborg.vbsupport.ru/showthread.php?t=251394
all seems to be working fine appart from 1 thing which i cant seem to find a fix for and im hoping someone can help me.

on the main forum page, theres the log in tab, click it and you get taken to a blank page with just the log in parts to fill in, fill these details in and click sumit and the page loads blank. login doesnt seem to work.

does anyone know how i can get this fixed?

regards
newbie
dan

X vBulletin 3.8.12 by vBS Debug Information
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X vBulletin 3.8.12 by vBS Debug Information

Page Generation 0.00895 seconds
Memory Usage 1,703KB
Queries Executed 10 (?)

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Template Usage:

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./includes/class_hook.php
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./includes/class_bbcode_alt.php
./includes/class_bbcode.php
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Hooks Called:

init_startup
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Messages:

X vBulletin 3.8.12 by vBS Debug Information
Page Generation 0.00895 seconds Memory Usage 1,703KB Queries Executed 10 (?)
More Information
Template Usage: (1)ad_footer_end (1)ad_footer_start (1)ad_header_end (1)ad_header_logo (1)ad_navbar_below (1)footer (1)gobutton (1)header (1)headinclude (6)option (1)post_thanks_navbar_search (1)printthread (1)printthreadbit (1)spacer_close (1)spacer_open Phrase Groups Available: global postbit showthread	Included Files: ./printthread.php ./global.php ./includes/init.php ./includes/class_core.php ./includes/config.php ./includes/functions.php ./includes/class_hook.php ./includes/modsystem_functions.php ./includes/class_bbcode_alt.php ./includes/class_bbcode.php ./includes/functions_bigthree.php Hooks Called: init_startup init_startup_session_setup_start init_startup_session_setup_complete cache_permissions fetch_threadinfo_query fetch_threadinfo fetch_foruminfo style_fetch cache_templates global_start parse_templates global_setup_complete printthread_start bbcode_fetch_tags bbcode_create bbcode_parse_start bbcode_parse_complete_precache bbcode_parse_complete printthread_post printthread_complete
Messages: