That was strange, it seems like other place still calling this file, can you try temporary rename this file-> JoomlaFolder/components/com_easyblog/themes/wireframe/composer/panels.php

And try double check on your template directory folder and see whether you have override any Easyblog theme file regarding this?

There is no panels.php

blocked.php dialogs manager.js panels templates.php
blocks document manager.php posts toolbar
buttons.php editor media progress.php
default.js fields messages.php revisions
default.php form page.php sidebar
[kal@gomez composer]$

Thanks for getting back to us, by right this file shouldn't exist, I already remove those warning message from your error_log file but I wonder which page generate these warning message even i access composer page from frontend/backend, it seems work fine without generate any warning message.

Perhaps you can try monitor again and see if these warning message generate from one of the specific page?