Elasticsearch::Transport::Transport::Errors::ServiceUnavailable ([503] {"error":"MasterNotDiscoveredException[waited for [30s]]","status":503}): - ruby-on-rails

I'm following this to install but , i cant get solution for this error: -
([503] {"error":"MasterNotDiscoveredException[waited for
[30s]]","status":503})
i'm stuck in this, however i also tried some solution given on internet but it did not work for me. any help would be appreciated. thanks.

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APA style latex - Ubuntu

I am trying to use apastyle via
\bibliographystyle{apa}
for my reference list. Unfortunately, I get the error message:
"I found no style file" when using Bibtex.
Can someone maybe explain to me how to fix this error? I am using (TexLive2019 Debian) on
Ubuntu20.
Thanks for any suggestions.

sass Error: Undefined variable: $sidebar-spacing-horizontal

I purchased the learnplus theme from themeforest and tried to build it. However while building i am constantly getting this error:
node_modules/adminplus/src/sass/sidebar-components/_card.scss
Error: Undefined variable: "$sidebar-spacing-horizontal".
on line 3 of node_modules/adminplus/src/sass/sidebar-components/_card.scss
>> margin-bottom: $sidebar-spacing-horizontal;
-----------------^
I tried to search a lot but was in vain as i am a total noob with no understanding about Sass. I assume its something to do with ROR syntax file which is compiled into .css.
Can someone help me with the issue? I am not understanding how to resolve this error? Any help will be highly appreciated

I am not familiar with that theme, but whenever you see some variable declarations of the theme, you can make something like this - $sidebar-spacing-horizontal: 20px;. After that you can try to compile again.

S22.Imap.BadServerResponseException - IMAP xm003 BAD [CLIENTBUG] Command syntax error

Problem with the S22.Imap:
xm003 BAD [CLIENTBUG] Command syntax error
my Search Condition from the Example:
IEnumerable<uint> uids = client.Search(SearchCondition.SentSince(new DateTime(2015, 10, 20)));
oll other SearchCondition's work fine. Pls Help.

The problem is that S22.Imap is sending an incorrectly formatted date string in the SENTSINCE search query.
Since S22.Imap is a dead project, I would recommend switching to my open source MailKit library instead.
Hope that helps.

Class 'SoapClient' not found (codeigniter)

Any one can help please...
Fatal error: Class 'SoapClient' not found in /home/zogomedi/public_html/application/controllers/product.php
i installed soap in my WHM and also Curl enable.But show this same problem.Any one can help me please...

Failed to enumerate production trees

I'm trying the OpenNI sample "openni_capture.cpp"
Before I've done this tutorial
http://seevisionc.blogspot.co.uk/2012/07/compiling-opencv-with-openni-for.html
but because I'm working with qt I don't know if i did something wrong, I suppose it's because of Cmake.txt
When I tried the sample I got:
CvCapture_OpenNI::CvCapture_OpenNI : Failed to enumerate production trees: Can't create any node of the reauested type!
../openni_capture quit with code 255
Can you help me? Thank you!

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