I just installed the Piwik and everithing went fine.
But sometimes it happens that I can not log me in. instead a receive always the same error message:
Warning: require_once(upgradephp/upgrade.php) [function.require-once]: failed to open stream: No such file or directory in /srv/www/vhosts/dacage.com/subdomains/lavuelta/httpdocs/piwik/core/testMinimumPhpVersion.php on line 88
Fatal error: require_once() [function.require]: Failed opening required ‘upgradephp/upgrade.php’ (include_path=’.:.:.:.:/usr/share/php5:/usr/share/php5/PEAR’) in /srv/www/vhosts/dacage.com/subdomains/lavuelta/httpdocs/piwik/core/testMinimumPhpVersion.php on line 88
after several refreshing of the page, I come to the log in and everithing works fine again. The same errormessage I receive from time to time in some of my widgets.
I can not understand why this error comes only from time to time and not always.
Do you have any solution for me?
thx for your help