change individual css

When I Change a individual css I will get the following message:

Etwas scheint schiefgelaufen zu sein. Warte einige Sekunden und versuche es dann erneut.

in english:

Something seems not working. Wait some seconds and try it again later.

Hope somebody can tell me how I can solve this Problem.
kindly regards

I will get the error also when I try do Change anything in the customizer.
Hope somebody can help me there.

Hey there,

I hope you are well today and thank you for your question.

Here’s a link that will help you to troubleshoot the issue.
Troubleshooting WordPress Customizer

Best regards,

Kindly regards for your answer.
I have delete some files on the Server.
I have now about 100mb free space. Before I had about 50mb free space.

Also I deactivate one plugin named duplicator.

After that the changes in the individual css will save again but the error message will still apear.

I also check my installed php and mysql Version. I use:

5.6 latest OpenSSL and mysql 5.0.

Do you have further ideas what I can do or what can be my Problem.
kindly regards.

Hello there,

I hope you are doing well today.

Why did you delete files from the server and what were they?
This may be the cause of the issue.

Best Regards,