Widgets like Last visit, list of keywords, best search engine, etc product the following error message. I had to turn of the privacy plugin

There is an error. Please report the message (Piwik 1.8.3) and full backtrace in the Piwik forums (please do a Search first as it might have been reported already!).

Notice: Undefined index: enable_auto_database_size_estimate in /home/earthshadow/domains/ia3/public_html/piwik-1.8.3/plugins/PrivacyManager/PrivacyManager.php on line 131

Backtrace -->
#0 Piwik_ErrorHandler(...) called at [Piwik_PrivacyManager::getPurgeDataSettings(...) called at /home/earthshadow/domains/ia3/public_html/piwik-1.8.3/plugins/PrivacyManager/PrivacyManager.php:318#2 Piwik_PrivacyManager::shouldReportBePurged(...) called at [Piwik_ViewDataTable->hasReportBeenPurged(...) called at /home/earthshadow/domains/ia3/public_html/piwik-1.8.3/core/ViewDataTable/HtmlTable.php:129#4 Piwik_ViewDataTable_HtmlTable->buildView(...) called at [Piwik_ViewDataTable_HtmlTable->main(...) called at /home/earthshadow/domains/ia3/public_html/piwik-1.8.3/core/Controller.php:152#6 Piwik_Controller->renderView(...) called at [Piwik_Referers_Controller->getKeywords(...) called at :#8 call_user_func_array(...) called at [Piwik_FrontController->dispatch(...) called at /home/earthshadow/domains/ia3/public_html/piwik-1.8.3/index.php:53