Answered AddOn causing error

I have tried some addon StercSEO from stercseo.

It didnt worked good and I deleted it, but now in logs i see some errors

[2015-11-17 06:44:34] (ERROR @ /index.php) Could not load class: StercSEO from stercseo.
[2015-11-17 06:44:34] (ERROR @ /index.php) Problem getting service stercseo, instance of class StercSEO, from path /xxx/core/components/stercseo/model/stercseo/

But in addons I dont see it, how can I fix this issues?

How did you delete it?

Sounds like the plugin itself is still existing, although its files are gone.

I have just removed from addons?
Is there a fix that i can delete from some config or database?

Look if there is a plugin 'StercSEO' left and delete it. Thats the only file that uses $modx->getService('stercseo', …) inside. After that you could delete all files in assets/components/stercseo and core/components/stercseo. You also could delete the stercseo namespace in System (cog sign) -> Namespaces, and two Chunks, one Snippet and the Category in the elements tree belonging to that package.

Normally this is done if you remove the package from Extras -> Package Manager but some packages have issues in the uninstall part.

There is no files that you mentioned?

Try deleting all files in the core/cache directory.