Error: Object is Like frozen

Error

Hello all
Since a short time I have an error message when I want to change something on my object. I can’t find a setting for it nor can I find anything else. I can create new sketches and extrude. But after that they are also frozen and I can’t change them anymore.

Does anyone know how I solve this problem?

Greetings
Stefan

(Wind 10, ZW3D 2019 x64 23.00)

HI Stefan:

Welcome to join. I think you may be caused by referring to the loss of an object. This is very common. Do you check whether the parent object is still there?
欢迎你的加入,我想你可能是参考某个对象丢失了造成的,这很常见,你检查下父对象还在吗?

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Hi and thanks for the answer.
I can not find something that would be loss there. I get the same message when i try to open a sketch.
The references there are just for the equation.

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