Capital letter in 'require_once'-path

hi,
after a successful installation of Piwik on one of my webspace.
I try the same on an other one.
this was the error-message:

require_once(API/Request.php) [function.require-once]: failed to open stream: No such file or directory 
in '/web/1/000/024/371/56955/htdocs/piwik/core/ViewDataTable.php' at the line 12

#0  Piwik_ErrorHandler(2, require_once(API/Request.php) [function.require-once]: failed to open stream: No such file or directory, /web/1/000/024/371/56955/htdocs/piwik/core/ViewDataTable.php, 12, Array ([GLOBALS] => Array ( *RECURSION*,[_ENV] => Array ([DOCUMENT_ROOT] => /web/1/000/024/371/56955/htdocs/piwik,[GATEWAY_INTERFACE] => CGI/1.1,[HTTP_ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8,[HTTP_ACCEPT_CHARSET] => ISO-8859-1,utf-8;q=0.7,*;q=0.7,[HTTP_ACCEPT_ENCODING] => gzip,deflate,[HTTP_ACCEPT_LANGUAGE] => de-de,de;q=0.8,en-us;q=0.5,en;q=0.3,[HTTP_CACHE_CONTROL] => max-age=0,[HTTP_CONNECTION] => keep-alive,[HTTP_COOKIE] => PHPSESSID=vb691vhj4nfcsooq5fdo80ek47,[HTTP_HOST] => wwwanalyse.my-domain.com,[HTTP_KEEP_ALIVE] => 300,[HTTP_USER_AGENT] => Mozilla/5.0 (X11; U; Linux i686; de; rv:1.9.0.10) Gecko/2009042523 Ubuntu/8.10 (intrepid) Firefox/3.0.10,[PATH] => /bin:/usr/bin:/usr/local/bin:/usr/local/php5/bin:/usr/local/php4/bin,[QUERY_STRING] => ,[REDIRECT_STATUS] => 200,[REMOTE_ADDR] => 82.82.138.38,[REMOTE_PORT] => 52006,[REQUEST_METHOD] => GET,[REQUEST_URI] => /,[SCRIPT_FILENAME] => /web/1/000/024/371/56955/htdocs/piwik/index.php,[SCRIPT_NAME] => /index.php,[SERVER_ADDR] => 82.100.220.32,[SERVER_ADMIN] => kundenservice@goneo.de,[SERVER_NAME] => wwwanalyse.my-domain.com,[SERVER_PORT] => 80,[SERVER_PROTOCOL] => HTTP/1.1,[SERVER_SIGNATURE] => 
Apache/2.0.63 Server at wwwanalyse.my-domain.com Port 80

i’m not confirm with the piwik program structure, but i’ve as much as i’ve understand the script is looking for ‘/core/API/Request.php’, but the folder ‘API’ is written as ‘api’.
does sombody know what does happen there?

[size=18pt]edit:
ah i see there was a failure in my unzipper.
evrythin ok
[/size]