Joomla 2.5.26

I have the following error.

Please make sure that the folder you are using in the Simple Image Gallery plugin tags exists and contains valid image files. The plugin could not locate the folder: images/slideshow
Call stack
# Function Location
1 JSite->dispatch() JROOT/index.php:42
2 JComponentHelper::renderComponent() JROOT/includes/application.php:197
3 JComponentHelper::executeComponent() JROOT/libraries/joomla/application/component/helper.php:351
4 require_once() JROOT/libraries/joomla/application/component/helper.php:383
5 JController->execute() JROOT/components/com_content/content.php:16
6 ContentController->display() JROOT/libraries/joomla/application/component/controller.php:761
7 JController->display() JROOT/components/com_content/controller.php:74
8 ContentViewArticle->display() JROOT/libraries/joomla/application/component/controller.php:722
9 JDispatcher->trigger() JROOT/components/com_content/views/article/view.html.php:123
10 JEvent->update() JROOT/libraries/joomla/event/dispatcher.php:161
11 call_user_func_array() JROOT/libraries/joomla/event/event.php:71
12 plgContentJw_sig->onContentPrepare()
13 plgContentJw_sig->renderSimpleImageGallery() JROOT/plugins/content/jw_sig/jw_sig.php:44
14 JError::raiseNotice() JROOT/plugins/content/jw_sig/jw_sig.php:195
15 JError::raise() JROOT/libraries/joomla/error/error.php:300

What I did so far:

1) Cache folder is writetable
2) Folder permission : 755, 644
    I have noticed all JW_SIG files are 640, so I have changed it into 644. but it does not solve.
3) K2 is not installed.
4) PHP 5.3
5) Xampp enviroments: Sig is working fine.
6) upload Akeeba backup jPA into server and set it up. The only JW_SIG is not working.

Please help me.

Hello,

Except the cache folder you need to chech the the cache/jw_sig folder is writable as well.

Also if you are using an .htaccess maker with Admin Tools extension, check if it disallows access to directories. In this case, it won't allow the plugin to directly access the /cache/jw_sig directory.
Add that to the exceptions in the HTACCESS maker and check again.

Thank you.

I found it out that the cause was web server. The web server changes Cache fiiles from 644 to 640.

I requested the hosting firm to correct the server setup.

Goyat

I'm glad you sorted it out.