Hi, can you check in your php error log, what error exactly occured.

PHP Fatal error: Cannot declare class Piwik\Plugins\UserCountry\LocationProvider\DefaultProvider, because the name is already in use in Piwik\Plugins\UserCountry\LocationProvider\Default.php on line 112

and

Error in Piwik (tracker): Error query: SQLSTATE[HY000]: General error 1366 Incorrect string value: '\xD7_\xD7\x97\xD7_...' for column 'name' at row 1 in query Insert Into Piwik_log_action (name, hash, type, url_prefix) Values (?, CRC32(?),?,?) Parameters: array:

Hi,
This is a duplicate of #11057

You can check there or here for the solution:

https://forum.piwik.org/t/piwik-3-0-0-core-plugin-usercountry-error/22203
(delete piwik/plugins/UserCountry/LocationProvider/Default.php)

its seems to fix the problem.
also #10378 disabled opcache and deleted plugins/CoreVisualizations/Visualizations/HtmlTable/PivotBy.php

any idea how to fix
Error in Piwik (tracker): Error query: SQLSTATE[HY000]: General error 1366 Incorrect string value: '\xD7_\xD7\x97\xD7_...' for column 'name' at row 1 in query Insert Into Piwik_log_action (name, hash, type, url_prefix) Values (?, CRC32(?),?,?) Parameters: array:

@galrotem1993 do you know the original value that should have been saved in this case? Which language is your website in?

the site is English, the content data is Hebrew.
i don't know if this is new error cause i never check that log, this could be an old issue

Hi there, to fix the issue can you try upgrade to the latest Matomo version?
https://matomo.org/docs/update/

if you still experience this issue afterwards, please re-open this and post a comment. Thanks!

Or on Windows - (set permission to "Everyone" stopped working) I needed to add IUSR for it to work again.