Fatal errors during installation


I am new to piwik.
I uploaded the files to a folder “analytics” on my server.

I set up a subdomain to the folder “analytics.mypage.com” and opened it.

I thought I can now easyly set up the database and so on, but it started with a lot of errors.
How can I fix them? I did not change any files from the Piwik installation package… i just unzipped and uploaded them.

Fatal error: Class 'Piwik\Plugins\SitesManager\API' not found in /home/u0082048411/public_html/analytics/core/Site.php on line 65

Fatal error: Uncaught exception 'Exception' with message 'Action 'safemode' not found in the module 'CorePluginsAdmin'.' in /home/user123/public_html/analytics/core/FrontController.php:182 Stack trace: #0 /home/user123/public_html/analytics/core/FrontController.php(177): Piwik\FrontController->triggerControllerActionNotFoundError('CorePluginsAdmi...', 'safemode') #1 /home/user123/public_html/analytics/core/FrontController.php(571): Piwik\FrontController->makeController('CorePluginsAdmi...', 'safemode', Array) #2 /home/user123/public_html/analytics/core/FrontController.php(96): Piwik\FrontController->doDispatch('CorePluginsAdmi...', 'safemode', Array) #3 /home/user123/public_html/analytics/core/FrontController.php(258): Piwik\FrontController->dispatch('CorePluginsAdmi...', 'safemode', Array) #4 [internal function]: Piwik\FrontController::triggerSafeModeWhenError() #5 {main} thrown in /home/user123/public_html/analytics/core/FrontController.php on line 182

Hi there

please check this FAQ: I get the error message: "Fatal error: Class 'not found in ...". What's wrong? - Analytics Platform - Matomo