Akeeba Solo

#36595 Akeeba Solo Login Application Error

Posted in ‘Akeeba Solo (standalone)’
This is a public ticket

Everybody will be able to see its contents. Do not include usernames, passwords or any other sensitive information.

Environment Information

PHP version
Akeeba Solo version

Latest post by cdh on Wednesday, 09 February 2022 11:57 CST


Updated to 7.5.16 on 4 instances of Solo on different sites without any issues in January.

Tried to log in today for updating to 7.6.0.

While login I get following message on 3 sites: Application Error 0: Value Error: Unknown format spezifier "S"

No further reaction. If I click on the message it returns to the login page.

Same behavior with Firefox, Chrome and MS Edge. Image is attached.

Update at one site was ok.

I installed 7.6.0 manually on two sites. Same error.

Thanks for your help in advance.

Kind regards from Germany


Akeeba Staff

I cannot reproduce this issue BUT I should not that I am using the only language we provide with Akeeba Solo itself: English.

It looks like you are using a German translation which we have not provided (we discontinued official translations in August 2018).

Seeing that you get an “Unknown format specified” error where the logout button should normally be I suspect that your SOLO_LOGIN_LBL_LOGOUT language string is incorrectly using %S (capital S) instead of %s (lowercase s).

This would be a problem with the language file which, as I already said, we have not provided ourselves. In PHP 5 and 7 this would have been an invisible warning. On PHP 8 and PHP 8 only this is a fatal error.


Nicholas K. Dionysopoulos

Lead Developer and Director

🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!


Many thanks for the fast reply.

Your diagnosis was spot on.

I had completely lost track of the old language files.

After deleting the folders, everything runs perfectly.

Warm greetings from Germany.

Claus Dieter

Support Information

Working hours: We are open Monday to Friday, 9am to 7pm Cyprus timezone (EET / EEST). Support is provided by the same developers writing the software, all of which live in Europe. You can still file tickets outside of our working hours, but we cannot respond to them until we're back at the office.

Support policy: We would like to kindly inform you that when using our support you have already agreed to the Support Policy which is part of our Terms of Service. Thank you for your understanding and for helping us help you!