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Oh yes ....
Thanks
Gian Carlo

Hi Stefan,
I have tried to use your solution introducing the code
\let\time\origtime
but I get the same problem. What am I doing wrong?

Gian Carlo

Hi Stefan,
in the attachment you can find the .tex and .cls files that generate the problem
Regards
Gian Carlo

Hi,
I have a document that is compiling without error only some warning (overfull \hbox and \vbox).
Now I wanted to include the package tikz and only including it (\usepackage{tikz})
I get a blank page at the beginning with only the following text:

by=1

I also get the following errors:

Error 1 ...