Joomla! Template 002040 - Item Support

I tried to disable but the error remains. I noticed that in k2 item settings / category filtering not show.

I saw the left of the template appears Mobile version see how to activate It?

I have the template as 002040 and in your installation appears see the mobile version in my not. because?

as in the version of 002040 on your site at the bottom left when I browse with the tablet appears a semi-circle with the words see the mobile version. I want to know if it is a module, a plugin or something?

Hello! Yesterday downloaded the demo version of the template. I found an error. When the user registration, after filling the form, after pressing the "Register" button sends an error page 404. What could be the problem and how to fix it?

If you switch on the site template-002050 registration work. A template-002040 registration gives an error 404. Please help me.

Hello,

Please check this website for me. I gives error and I do not know how to permanently resolve it.

http://alamanat.com.ng/

Is there a simple way to identify the affected extension? I have tried disabling some but no luck.

From t5\he available information when I debug, all the affected plugins are joomla core plugin and uninstalling or disabling these plugins are not posible.

Error decoding JSON data: Syntax error

Call stack
# Function Location
1 JApplicationCms->execute() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/index.php:49
2 JApplicationSite->doExecute() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/application/cms.php:261
3 JApplicationSite->initialiseApp() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/application/site.php:209
4 JApplicationCms->initialiseApp() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/application/site.php:681
5 JPluginHelper::importPlugin() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/application/cms.php:669
6 JPluginHelper::import() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/plugin/helper.php:170
7 plgSystemJblibrary->__construct() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/plugin/helper.php:255
8 JPlugin->__construct() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/plugins/system/jblibrary/jblibrary.php:45
9 Joomla\Registry\Registry->loadString() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/cms/plugin/plugin.php:75
10 Joomla\Registry\Format\Json->stringToObject() /hermes/bosnaweb22a/b2031/ipg.cliqcares/alamanat/libraries/vendor/joomla/registry/src/Registry.php:366

I can not activate the frontend-editing in the k2-articles.
Can You help me?

I've found the mistake.
Now I have a new problem:

I have a problem in the frontend.
It's not possible to save a new article.
There is no reaction, when I click on the button "Speichern".
Can You help me?

Hello,

I get 0 - Error decoding JSON data: Syntax error after installing and launching as 002040 quickstart. What is the way out?