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Problem solved. I looked at the .toc file and find the \@mathbb. Don't know why it is written in this file but OK. I deleted the .toc file and run again my .tex including the \tableofcontents. Now it works fine.

Thanks for the help, I don't thought that the Undefined Sequence Message was crucial ...

Thx for that advice. The problem is, that I tried to fix it. At first it is curious, that that message only occurs when I use latex and not pdflatex. At second I never used \@mathbb. At this place where the error occurs stands an \S which is defined via \renewcommand{\S}{\mathbb{S}}.

I've deleted ...

Hi,

I write a document on the system in my office. It is a Linux Distribution, but I don't think that this fact is important for my problem.

On that system I run latex -> dvips and get a my ps File. No problems there. Now I tried to run it on my Windows Laptop with MikTex and Textpad.

If I run ...