Hi @ali.ahmadiani,
you should check the path and name of the plugin.
I don’t know what versions from OJS and usageStats plugin you are working with; but the path should probably be your_ojs_dir/plugins/generic/usageStats
And always ensure that the plugin folder name matches the <application>
value from the version.xml
file, i.e: usageStats
(https://github.com/pkp/usageStats/blob/main/version.xml#L14)
Edit: look at this