Error messages in the outbox during test.

When checking my outbox, I get two error messages that I can't do anything with. The second one at the top with "Array" I don't know at all what it says and the first one at the bottom must have something to do with currencies. I only have one (Euro) and have turned off the included dollars and pounds.
There is then also no button for continue or similar.
What can I do about this?

Hmm.. an amount that is trying to be rounded for hidden decimals is not a number but an empty string. Are there any order total addons in place? It could be inherited from a faulty returned value of the zone weight shipping module. Because there is something invalid about that rate table.

Thank you very much. Through the hints I already knew better where to look. I have only installed the modules "Zone based shipping" and "pick up". Unfortunately I didn't find any other modules that were made for sending address Germany, but only for other countries.
The first small error message I managed to get away by removing the predefined words "Ask" in the lines for zone 3 and below in the module "Zone based shipping".
The larger error message was certainly a mistake on my part, because I had loaded the "Handling Fee" module, but had not entered a price for handling.
But now I have a new error message (see picture) and on the same picture you can see that no shipping costs are added to the final amount and I don't know why.
Also not why in the shopping cart always appears twice under Shipping Zone based shipping Germany.

Try to load the first image, because only two will work here. With three, all are gone every time.

Geo zone 3 has no rate table. Unset geo zone 3.

Thanks for the quick help. So this error is also gone.

If I now knew why the transport costs are visible but not added to the result, I would be a whole step closer to perfection ;)

Oh it's you again. So the problem is resolved but there is still a bit of dissatisfaction left?

If I wrote a thousand pages documentation covering every inch of the platform. Would you read it? Nah, it would probably too long, too advanced, too boring, or simply not good enough.

I don't quite understand your post. Is there something wrong again with my wording that has offended you? Do you like to assume always first negative motives of your users at their questions?
You can be quite sure that every time I have stumbled over something, I have looked through all conceivable settings for me and searched in the forum before I ask a question. Unfortunately, in the forum search, if you enter two or three words, almost always come 100-300 answers and then they have 99% nothing to do with the search.
Now I found the setting error: because I had not switched on the module "Shipping Fee", because of the text
"Free Shipping Table
Free shipping table in standard CSV format with column headers."
and I thought and still think, just nothing to do with such a table.