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Thanks a lot.

I will follow your second advice (the smart way) ...

Dear Johannes,

Thank you very much for your quick reply.

Please attached some files that may be useful.

You are certainly right.

In the error message, it is mentioned that I have used the old interface to call Babel (I do not know how to call the new interface).

As you have guessed it, it is ...

Hello.

I would be grateful to you if you help me please.

Around 3 weeks ago, I have installed TeXnicCenter 2.02 stable (64 bits).

Files that worked well with the former version of TeXnicCenter no longer work (LaTeX => PDF) no longer works.

I get many errors message and the main one is Undefined ...