That is weird. If debug output is off it should definitely not show this message. Can you turn on debug output and see what the errors are about? It would also be good if you could report this as a bug.
There are usually warnings about missing translations. But that's normal because I have to use an incomplete translation file (why? that's a whole another story).
Errors happen only somatimes, and are about indexes but that's probably not a problem in eZ due to insufficient database rights. I contacted the server admin to fix this.
All this errors are not a prolem, but the problem is that error warning is written on top of the page even when debug i diabled. I'll post it as a bug.
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Nothing is impossible. Not if you can imagine it!