Unable to copy to Cache directory
Installation and Configuration
sekeri:It is there because I can display it with template editor.
modules/jrCore/templates/page_link_cell.tpl
modules/jrCore/templates/page_link_cell.tpl
That doesn't for sure mean it is there - does that template show modified at all?
The error you are getting only happens because either that template file is NOT readable, or where it is trying to copy it to:
data/cache/jrCore
is not writable by the web user.