I've never seen this, unfortuneatly this is in production so I could really use some help here: https://cdn.discordapp.com/attachments/1343485686929559645/1343485687097458699/image.png?ex=67bd720c&is=67bc208c&hm=2b7e9d989ded0fb49f3b295d388926b1eab37055b5ac6213b916d3996ed6960c&

It happens exactly for the reason it says: the file is too large. Really nothing you can do about it except delete the log files. Also check what is being logged and finetine to make sure the file doesn't get too large.

I deleted all files except one now, but still the logviewer tells me the file is to large

We have the same issue on some sites from time to time. But for production, I really think you should use additional logging stores. We use Application Insights in Azure for our logging for instance. This doesn't break as easily as the file based logging via the backoffice.

You should only need to delete the one that's trying to be shown, likely the current days. Worth checking your code and anywhere you can reduce the logging

you can always try to narrow down the period, and if that doesnt help you can find the physical file on the server possibly if you have access.