no reports by period

After selecting a timeperiod it is not possible to create a report (report range:day, week).
After selecting a "day" same reports work fine.

Also can not create a report by "YEAR"

Piwik 1.12/german

<result><error message="API returned an error: VisitTime.getByDayOfWeek does not support multiple dates. "/></result>
or
Fatal error: Call to undefined method Piwik_DataTable_Array::getRows() in /homepages/.../piwik/plugins/MultiSites/API.php on line 256
or
<error message="API returned an error: Referrers.getAll with multiple sites or dates is not supported (yet). "/>
depending on report field selection

Sal Guri