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I am sorry for that, you are right. I have found my problem in the author email address field, since I didn't notice the underscore in the address which generates a confused error to me.

Your help is highly appreciated and I am sorry again for my confusion.

I tried your suggestion and it worked only for my minimal example.

While for my main manuscript, every second compilation time generates an error preventing the compilation process from completion, so I delete the .aux file and then the first compilation time goes smoothly, while having the same ...

I am trying to complete an article in Elsevier format, however, it is my first time in applying Elsevier format with natbib bibliography format. Accordingly, in the following minimal example, the reference is printed correctly, but without its citation in the main text. I am using Winedt 7 with ...

Thanks for fast help, it works like a charm.

I am working on compiling a LaTeX article in the format required by Elsevier. However, it worked before good, but now I have a problem of not producing the title, abstract and keyword environments. Except that, all the remaining manuscript can be generated smoothly. I tried to make a minimal example ...