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Thanks for your help. I fixed the problem by removing and then reinstalling Miktek. Now it works. I don't understand what was wrong with the Miktek installation, but it works.

Thanks, I fixed that typo, but it is not the problem.

According to Lamport's book on LaTeX, this error occurs when LaTeX is expecting but not finding a number as an argument. But, I should be able to have an enumeration without defining a counter?

I don't know why, but in Texnet when I have an enumeration I get an error:

! Missing number, treated as zero.
<to be read again>
\relax

The code is simple, but will not work? Am I missing something? Or do I need to do something in configuration?

Thanks, this really puzzles me.
the code ...