Error after changing language

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Hi, I have an error after switching to another language: '_' is not a valid locale identifier.
The solution mentioned in other topics about Softaculous are not relevant as it is correct stated in the concrete.php file: 'locale' => 'nl_NL'.
And it blocks the whole site.
Any suggestions?

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mlocati replied on at Permalink Reply
mlocati
In order to understand what's going wrong and to solve the issue, we'd need to know when that happens and the stack trace...
admin replied on at Permalink Reply
Where do I find the stack trace?
I can't repeat it.
After changing the language and than updating from 8,2.1 to 8.3.2 it happened.
admin replied on at Permalink Reply
Oké I changed the theme to see if something changed.
What happens is that I can change a color or an image but it does not become visible after saving on the page. When I change text and save I got the error:
{message: null,title: null,time: "2018-02-03 13:16:40",redirectURL: "",aID: 369,arHandle: "Footer 01",bID: 351,cID: "151",pages: [{name: "Page Not Found",cID: "151"}]}
I can go to the dashboard site with settings and see and click everything, but when I go to sitemap and click on one of the pages and "view" I got the error:
An unexpected error occurred.
'_' is not a valid locale identifier
If I click the back home button present there it just keeps on giving the same error.
Kind of visual circle....
Oh and I also changed back to the English (use) language but as you can read that doesn't change anything...
admin replied on at Permalink Reply
Oké I uninstalled Concrete and reinstalled.
There was no error.
Installed was 8.1.0.
I updated to 8.2.1 after that directly got the
An unexpected error occurred.
'_' is not a valid locale identifier
admin replied on at Permalink Reply
Oké again I uninstalled Concrete and reinstalled it
There was no error.
Installed was 8.1.0.
Changed the language
No error!!!
I updated to 8.2.1 after that directly got the error!!
An unexpected error occurred.
'_' is not a valid locale identifier

So clear steps I have taken to show you were it goes wrong.
admin replied on at Permalink Reply
Oké forget it. Starting with a software and than directly having 2 errors which seems not to solve easily does say enough for me. Don't use it. Thus I found other software that works. A pity but well live goes on.