Api error

Hello, in 0.2.37 i get this error

Fatal error: Class ‘Piwik_Apiable’ not found in /home/noisecol/public_html/piwik/plugins/ExamplePlugin/API.php on line 35

when i click the API link.
where is the problem?

make sure all files are uploaded properly, this class is not in use anymore so it must be from old files

I just installed th elatest release and I’m having the same problem. I want to get the token_auth but when I click on API I get the error message. I just dont understand the previous reply about a class not being availble anymore. Where and how do I find the token, then?

Some files may have been renamed or removed.

Please install Piwik in a new folder instead of overwriting an old install.

That helped - why didn’t I think of that? Thank you very much for your help.

Regards,
Leyla