Error 500 with Wallabag server 2.3.5

[biva]

Hello,
I just updated to 2.3.5 and my wallabag on android (2.1.0) displays now this error:
Error: com.di72nn.stuff.wallabag.apiwrapper.exceptions.UnsuccessfulResponseException: HTTP response: 500 Internal Server Error
I tried to reinstall the app, but same issue :(

I see a lot of related issues but I don't find a solution for me (#649 or #97 or #731 for example)

[biva]

@j0k3r thank you for your comment in wallabag/wallabag#3817

It's a bad configuration.

Is it a bad configuration on my wallabag server? My Android client? Of wallabag server in general?
How could I investigate this issue?

For reference:

• Android client and Firefox addon were working before I updated to 2.3.5
• Firefox addon is still working with 2.3.5
• Android client is not working anymore ("error 500"), but the identification is working (a new client/token is created after I enter my credentials on Android app 2.1.0 beta (108)
• I tried to clear the cache on the server cache:clear -e=prod

[j0k3r]

I said it's a bad wallabag configuration for the related issue, not yours.
Can you check for logs in wallabag? like var/logs/*

[biva]

logs:

[2019-01-02 15:47:09] request.INFO: Matched route "api_get_version". {"route":"api_get_version","route_parameters":{"_controller":"Wallabag\ApiBundle\Controller\UserRestController::getVersionAction","_format":"json","_route":"api_get_version"},"request_uri":"https://www.mywallabag.com/api/version.json","method":"GET"} []
[2019-01-02 15:47:09] app.ERROR: Authentication failure for user "", from IP "192.168.1.1", with UA: "okhttp/3.11.0". [] []
[2019-01-02 15:47:10] request.INFO: Matched route "api_get_entries". {"route":"api_get_entries","route_parameters":{"_controller":"Wallabag\ApiBundle\Controller\EntryRestController::getEntriesAction","_format":"json","_route":"api_get_entries"},"request_uri":"https:// www.mywallabag.com/api/entries.json?order=desc&page=1&perPage=1&since=0&sort=created","method":"GET"} []
[2019-01-02 15:47:10] request.CRITICAL: Uncaught PHP Exception InvalidArgumentException: "The directory "/var/www/html/wallabag/var/cache/prod/jms_serializer" is not writable." at /var/www/html/wallabag/vendor/jms/metadata/src/Metadata/Cache/FileCache.php line 39 {"exception":"[object] (InvalidArgumentException(code: 0): The directory "/var/www/html/wallabag/var/cache/prod/jms_serializer" is not writable. at /var/www/html/wallabag/vendor/jms/metadata/src/Metadata/Cache/FileCache.php:39)"} []

[biva]

I made the directory writable with
sudo chown -R www-data:www-data bin app/config vendor data web var
And now it works :)
Thank you!!

[j0k3r]

https://doc.wallabag.org/en/admin/installation/rightaccess.html 😉