Adding New Module - Articles-Newsflash

[FunFusionCa]

When adding a new "Articles-NewsFlash" Module - I am receiving an error message.
I would appreciate any insights or assistance, as I am a true novice. Thank you!
(I am building this site locally on WAMP)

[FunFusionCa]

Sorry, forgot to mention, Joomla 2.5.6

[FunFusionCa]

I managed to copy the error message, so if anyone can offer me any asisstance I appreciate it!

This is the error message:

Notice: Array to string conversion in C:\wamp\www\components\com_content\models\articles.php on line 129
Call Stack
# Time Memory Function Location
1 0.0004 261504 {main}( ) ..\index.php:0
2 0.2831 8801792 JSite->render( ) ..\index.php:48
3 0.2942 9018488 JDocumentHTML->render( ) ..\application.php:271
4 0.2942 9018552 JDocumentHTML->_renderTemplate( ) ..\html.php:433
5 0.3124 9183200 JDocumentHTML->getBuffer( ) ..\html.php:655
6 0.3124 9183640 JDocumentRendererModules->render( ) ..\html.php:371
7 0.3144 9184328 JDocumentRendererModule->render( ) ..\modules.php:39
8 0.3146 9187896 JModuleHelper::renderModule( ) ..\module.php:107
9 0.3171 9220520 include( 'C:\wamp\www\modules\mod_articles_news\mod_articles_news.php' ) ..\helper.php:175
10 0.3187 9269832 modArticlesNewsHelper::getList( ) ..\mod_articles_news.php:15
11 0.3198 9278032 ContentModelArticles->getItems( ) ..\helper.php:60
12 0.3198 9278032 JModelList->getItems( ) ..\articles.php:476
13 0.3198 9278032 ContentModelArticles->getStoreId( ) ..\modellist.php:118

( ! ) Notice: Array to string conversion in C:\wamp\www\components\com_content\models\articles.php on line 129
Call Stack
# Time Memory Function Location
1 0.0004 261504 {main}( ) ..\index.php:0
2 0.2831 8801792 JSite->render( ) ..\index.php:48
3 0.2942 9018488 JDocumentHTML->render( ) ..\application.php:271
4 0.2942 9018552 JDocumentHTML->_renderTemplate( ) ..\html.php:433
5 0.3124 9183200 JDocumentHTML->getBuffer( ) ..\html.php:655
6 0.3124 9183640 JDocumentRendererModules->render( ) ..\html.php:371
7 0.3144 9184328 JDocumentRendererModule->render( ) ..\modules.php:39
8 0.3146 9187896 JModuleHelper::renderModule( ) ..\module.php:107
9 0.3171 9220520 include( 'C:\wamp\www\modules\mod_articles_news\mod_articles_news.php' ) ..\helper.php:175
10 0.3187 9269832 modArticlesNewsHelper::getList( ) ..\mod_articles_news.php:15
11 0.3198 9278032 ContentModelArticles->getItems( ) ..\helper.php:60
12 0.3198 9278032 JModelList->getItems( ) ..\articles.php:476
13 0.3207 9278248 JModelList->_getListQuery( ) ..\modellist.php:127
14 0.3207 9278392 ContentModelArticles->getStoreId( ) ..\modellist.php:96