Fatal Error Please Help

@gblss wrote:

Updated to 3.0.0 would not work at all.
Went back to 2.17 and was required to udate database by piwik software.
Now getting this error.
Can you please help me with that. Please

Fatal error: Class Piwik\Plugins\CoreVisualizations\Visualizations\Sparklines contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Piwik\Plugin\ViewDataTable::buildView) in /home/blssco5/public_html/piwik/plugins/CoreVisualizations/Visualizations/Sparklines.php on line 164
Piwik encoutered an error: Class Piwik\Plugins\CoreVisualizations\Visualizations\Sparklines contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Piwik\Plugin\ViewDataTable::buildView) (which lead to: Zend_Session is currently marked as read-only.)
Widget

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