After upgrading Piwik 1.1.11 to 1.12, I receive the same error message than last time :
[i][size=small]There is an error. Please report the message (Piwik 1.12) and full backtrace in the Piwik forums (please do a Search first as it might have been reported already!).
Warning: htmlspecialchars() [function.htmlspecialchars]: Invalid multibyte sequence in argument in /home/www/piwik/core/DataTable/Filter/SafeDecodeLabel.php on line 52
Backtrace -->
#0 Piwik_ErrorHandler(…) called at [:]
#1 htmlspecialchars(…) called at [/home/www/piwik/core/DataTable/Filter/SafeDecodeLabel.php:52]
#2 Piwik_DataTable_Filter_SafeDecodeLabel::safeDecodeLabel(…) called at [/home/www/piwik/core/DataTable/Filter/SafeDecodeLabel.php:67]
#3 Piwik_DataTable_Filter_SafeDecodeLabel->filter(…) called at [/home/www/piwik/core/DataTable.php:390]
#4 Piwik_DataTable->filter(…) called at [/home/www/piwik/core/DataTable.php:415]
#5 Piwik_DataTable->applyQueuedFilters(…) called at [/home/www/piwik/core/API/ResponseBuilder.php:281]
#6 Piwik_API_ResponseBuilder->handleDataTable(…) called at [/home/www/piwik/core/API/ResponseBuilder.php:77]
#7 Piwik_API_ResponseBuilder->getResponse(…) called at [/home/www/piwik/core/API/Request.php:147]
#8 Piwik_API_Request->process(…) called at [/home/www/piwik/core/ViewDataTable.php:423]
#9 Piwik_ViewDataTable->loadDataTableFromAPI(…) called at [/home/www/piwik/core/ViewDataTable/HtmlTable.php:79]
#10 Piwik_ViewDataTable_HtmlTable->main(…) called at [/home/www/piwik/plugins/Actions/Controller.php:475]
#11 Piwik_Actions_Controller->configureGenericViewActions(…) called at [/home/www/piwik/plugins/Actions/Controller.php:420]
#12 Piwik_Actions_Controller->configureViewActions(…) called at [/home/www/piwik/plugins/Actions/Controller.php:46]
#13 Piwik_Actions_Controller->getPageUrls(…) called at [:]
#14 call_user_func_array(…) called at [/home/www/piwik/core/FrontController.php:125]
#15 Piwik_FrontController->dispatch(…) called at [/home/www/piwik/index.php:47][/size][/i]
This problem was mentionned after upgrading Piwik to 1.1.11 in this thread :
http://forum.piwik.org/read.php?2,101866,101866
PHP Version running Piwik : 5.2.6
Piwik language label : french