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Have installed the Piwik module in Drupal 7 but when checking on the reports page I get this error

• Notice: Undefined property: stdClass::$data in piwik_reports_get_sites() (line 449 of /home/pandemon/public_html/sites/all/modules/piwik_reports/piwik_reports.module).
• Warning: Invalid argument supplied for foreach() in piwik_reports_siteselect_form() (line 67 of /home/pandemon/public_html/sites/all/modules/piwik_reports/piwik_reports.pages.inc).

Any help will be most gratefull

Thanks