Could not found load model total/subtotal OpenCart - php

Suddenly I started to recieve the below error when tring to access mysite.com after installing opencart. I kindly request your help on how to solve this ...
Notice: Error: Could not load model total/sub_total! in /home/xxxxx/public_html/system/engine/loader.php on line 37

Steps to try :
Check whether this file exists: catalog\model\total\sub_total.php.
Verify the file permission of catalog\model\total\sub_total.php.

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After creating .theme file in my template folder (whether empty or not), I get the following error message:
The website encountered an unexpected error. Please try again later.RuntimeException: Failed to start the session because headers have already been sent by "/homepages/d825952918/htdocs/themes/universaldenker/universaldenker.theme" at line 1. in Symfony\Component\HttpFoundation\Session\Storage\NativeSessionStorage->start() (line 145 of vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php).
If I delete .theme file again, everything works again. I think it has something to do with opcache, because the path "/homepages/d825952918/htdocs/themes/universaldenker/universaldenker.theme" comes from the .opcache folder.
Can anyone help me?

Fatal error: Class 'Extendware_EWCore_Model_Autoload' not found

I'm getting the below error while loading my Magento(Version 1.7) in local.I have checked the google and tried few things like setting permissions(chmod),Flushing cache etc, But it didn't workout well.
Below is the error
Fatal error: Class 'Extendware_EWCore_Model_Autoload' not found in /Applications/XAMPP/xamppfiles/htdocs/magento/magento/app/code/local/Varien/Autoload.php on line 14
Can anyone suggest me what to do on this?
Thanks in advance!
Can you please check for the configuration file in the directory:
app/etc/modules/
Look out for a file which has registered probably Extendware_*.xml there might be more than one of them which will need to be disabled/removed.
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CodeIgniter Database Session Error

When I try to execute any controller of my CodeIgniter project i receive this error:
Fatal error: Class CI_Session_files_driver contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (SessionHandlerInterface::read) in D:\Git\crud-farm\system\libraries\Session\drivers\Session_files_driver.php on line 49
A PHP Error was encountered
Severity: Error
Message: Class CI_Session_files_driver contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (SessionHandlerInterface::read)
Filename: drivers/Session_files_driver.php
Line Number: 49
Backtrace:
I tried to replace CodeIgniter system files but it didn't work. The problem appears in all projects
Problem solved by restarting Apache.
I attach the url which saved me: http://forum.codeigniter.com/thread-64763.html
In my case i did the following
Restart apache
That's it!
The files in system should not be modified. My files were modified somehow and were throwing error. I resolved my problem as below.
Download fresh codeigniter and extract files
copy system files from fresh codeigniter into your project and overwrite the whole system folder.
This should fix your problem.

open cart fatal error Cannot redeclare ModelSaleCustomer::getNewsletterSubscribers()

When I open backend of opencart it returns
Fatal error: Cannot redeclare ModelSaleCustomer::getNewsletterSubscribers() in
/home/eshopnsa/public_html/vqmod/vqcache/vq2-admin_model_sale_customer.php on line 515
I don't understand this. Please help me.
This error beacuse of any previous free version of newsletter by other developer installed on your store... reason: wither u have a vqmod from that module or done manuall changes in files... please remove the other vqmod u already had, and just use the mod xml supplied with this mod...or if u did manually changes in past for free newsletter module, replace original files or undo changes by that mod..

Could not found load model sale/order OpenCart

Suddenly I started to recieve the below error when tring to access mysite.com/admin
There are no solutions on the internet, so I kindly request your help on how to solve this
Notice: Error: Could not load model sale/order! in /home/hirdavatdeposu.com/httpdocs/system/engine/loader.php on line 48
Re upload the file (unsure as to which it is, so just upload both) from a fresh copy
/catalog/model/sale/order.php
/admin/model/sale/order.php

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