Help with white pages please

[Barbara1]

hello guys,
4.1.9 user here.

for 2 days now i have that white page problem when i try to edit the "header" , "headinclude", "addition.css" or any variable (even the "tools.php") leads me to white page.
i cannot also add a theme.
what happens is that i upload it, i see it activated at admincp styles, but it does not appear at the theme list of the forum. and i cannot delete any theme either.

these are some messages i got since the problem appeared
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vBulletin datastore error caused by one or more of the following:
You may have uploaded vBulletin files without also running the vBulletin upgrade script. If you have not run the upgrade script, do so now.
The datastore cache may have been corrupted. Run Rebuild Bitfields from tools.php, which you can upload from the do_not_upload folder of the vBulletin package.

Fatal error: vBulletin datastore cache incomplete or corrupt in [path]/includes/init.php on line 252

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Warning: require_once([path]/includes/adminfunctions_templateedits.php): failed to open stream: No such file or directory in [path]/includes/adminfunctions_template.php(3172) : eval()'d code on line 4
Fatal error: require_once(): Failed opening required '/(***)/includes/adminfunctions_templateedits.php' (include_path='.:/usr/local/share/pear') in /***/includes/adminfunctions_template.php(3172) : eval()'d code on line 4

(i dont have the "adminfunctions_templateedits.php" even in the zip file from vbulletin.com

any clues?
can anyone help me with this plz?

thank you in advance