Error after install magento 2 rc with sample data

[minhluan259]

sytems.log

[2015-11-07 03:38:28] main.CRITICAL:
Compilation from source:
frontend/Magento/luma/en_US/css/email.less
variable @modal-slide-header__padding-vertical is undefined in file D:/App/htdocs/magentodev/var/view_preprocessed/css/frontend/Magento/luma/en_US/css/source/_theme.less in _theme.less on line 254, column 37
252| // Modal popup
253| @modal-action-close__font-size: @font-size__base;
254| @modal-slide-action-close__padding: @modal-slide-header__padding-vertical @modal-popup__padding;
255|
256| // Checkout tooltip icon
257| @checkout-tooltip-icon__font-size: 21px;
[] []
[2015-11-07 03:38:29] main.CRITICAL:
Compilation from source:
frontend/Magento/luma/en_US/css/email-inline.less
variable @modal-slide-header__padding-vertical is undefined in file D:/App/htdocs/magentodev/var/view_preprocessed/css/frontend/Magento/luma/en_US/css/source/_theme.less in _theme.less on line 254, column 37
252| // Modal popup
253| @modal-action-close__font-size: @font-size__base;
254| @modal-slide-action-close__padding: @modal-slide-header__padding-vertical @modal-popup__padding;
255|
256| // Checkout tooltip icon
257| @checkout-tooltip-icon__font-size: 21px;
[] []
[2015-11-07 03:42:39] main.ERROR: Sample Data error: Error in data structure: entity values are mixed [] []
[2015-11-07 03:43:25] main.ERROR: Sample Data error: Notice: Undefined index: Black
in D:\App\htdocs\magento2-sample-data\app\code\Magento\SwatchesSampleData\Model\Swatches.php on line 131 [] []

[MomotenkoNatalia]

Related issue #2273, #2306

[dmitrii-fediuk]

My universal fix for all the «variable @modal-slide-header__padding-vertical is undefined» problems: https://mage2.pro/t/193

[woei66]

diff --git a/app/design/frontend/Magento/luma/web/css/source/_theme.less b/app/design/frontend/Magento/luma/web/css/source/_theme.less
index 3ff123e..cbb274d 100644
--- a/app/design/frontend/Magento/luma/web/css/source/_theme.less
+++ b/app/design/frontend/Magento/luma/web/css/source/_theme.less
@@ -19,6 +19,8 @@
@icons__font-path: '@{baseDir}fonts/Luma-Icons';
@icons__font-name: 'luma-icons';

+@import 'components/_modals.less';
+
// Color nesting
@panel__background-color: @color-gray-light0;
@border-color__base: @color-gray80;

[woei66]

reference to #2273 (comment)
you should

1. modify the app/design/frontend/Magento/luma/web/css/source/_theme.less
2. rm -rf var/
3. bin/magento setup:upgrade
4. bin/magento setup:static-content:deploy

[woei66]

sometime, you may see the memory message like
PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 12475503 bytes)
you should modify the /etc/php.ini or /etc/php-5.6.ini and change the memory_limit = 512M

[minhluan259]

@woei66 @dfediuk , i've fixed _theme.less
but remaining errors

[2015-11-07 03:42:39] main.ERROR: Sample Data error: Error in data structure: entity values are mixed [] []
[2015-11-07 03:43:25] main.ERROR: Sample Data error: Notice: Undefined index: Black
in D:\App\htdocs\magento2-sample-data\app\code\Magento\SwatchesSampleData\Model\Swatches.php on line 131 [] []

Data were missing something

[vektor-dev]

Same problem here:
Compilation from source:
frontend/Vektor/petscorner/en_US/css/email-fonts.less

Any way of sorting it out?