Issue using an existing configured piwik db on another server; same php version and piwik version (1.5.1)

I’m attempting to plug in a copy of our current piwik production db (configured for 1.5.1) on our test server. Hitting this error, along with a general breaking of the html on the page.

There is an error. Please report the message and full backtrace in the Piwik forums (please do a Search first as it might have been reported already!).

Notice: Array to string conversion in /data/piwik-1.5.1/core/PluginsFunctions/WidgetsList.php on line 38

Backtrace -->
#0 Piwik_ErrorHandler(…) called at [/data/piwik-1.5.1/core/PluginsFunctions/WidgetsList.php:38]#1 Piwik_WidgetsList::add(…) called at [/data/piwik-1.5.1/core/PluginsFunctions/WidgetsList.php:74]#2 Piwik_AddWidget(…) called at [/data/piwik-1.5.1/plugins/VisitsSummary/VisitsSummary.php:70]#3 Piwik_VisitsSummary->addWidgets(…) called at [:]#4 call_user_func_array(…) called at [/data/piwik-1.5.1/libs/Event/Dispatcher.php:284]#5 Event_Dispatcher->postNotification(…) called at [/data/piwik-1.5.1/core/PluginsManager.php:609]#6 Piwik_PostEvent(…) called at [/data/piwik-1.5.1/core/PluginsFunctions/WidgetsList.php:26]#7 Piwik_WidgetsList::get(…) called at [/data/piwik-1.5.1/core/PluginsFunctions/WidgetsList.php:69]#8 Piwik_GetWidgetsList(…) called at [/data/piwik-1.5.1/plugins/Dashboard/Controller.php:25]#9 Piwik_Dashboard_Controller->getDashboardView(…) called at [/data/piwik-1.5.1/plugins/Dashboard/Controller.php:36]#10 Piwik_Dashboard_Controller->embeddedIndex(…) called at [:]#11 call_user_func_array(…) called at [/data/piwik-1.5.1/core/FrontController.php:136]#12 Piwik_FrontController->dispatch(…) called at [/data/piwik-1.5.1/index.php:53]

If any further information is needed, let me know.

Can you make full backup and try the update nonetheless, since this is just a NOTICE and not a warning/error ?