Pager Error Invalid file: Pagers(slash)bs_full.php

Maybe CodeIgniter exception feedback for these cases could be written somehow less cryptic or with a more explicit complain

It is true.
But how do we improve it?

CI shows:

Invalid file: Pagers\bs_full.php

This shows bs_full.php in the namespace Pagers is invalid.

Any idea?

I see

Instead of "invalid file" could be
"namespace path not found"

Or even explicit

"something in namespace /Pagers is wrong"

in such a way that makes you think about a path and not a file (in this case)

Though, "invalid" takes you on a wrong road , because the file itself works fine in another host