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It's similar like behind the link you've posted, the \nonumber is causing the problem. But use equation*, not eqnarray*.

Did adjusting the paper sizes help?

Stefan

Yes, adjusting paper sizes helped perfectly, like using equation* instead of equation. What exactly is the difference between these ...

Hi Ekim,
There should be a better solution, but in order to find the cause of the pdftex/hyperref/equation problem I need to know more of your code. A minimal working example would provide a way to fix it.

Stefan

Dear Stefan,

This MWE produces the same error. I hope it is actually a "MWI ...

Now I can see you've inserted the complete error message:

...[56][57]pdfTeX warning (ext4): destination with the same identifier name (name{equation3.111}) has been already used, duplicate ignored
<to be read again>

It's just a warning regarding hyperlinking. Have a look here in the UK TeX ...

Hi Ekim,

welcome to the board!
You've set options for hyperref by \hypersetup but also by \usepackage. You should not use dvips and pdftex together.

The code piece you've posted could work, for instance with the article class. It could cause an error if it would be used with a class that's ...

Dear all,

I am still a starter to LaTeX, trying to learn the basics. I am getting the following error, although I am sure that the same log worked in other computers:

"Option clash for package hyperref."

My preambles for hyperref are:

\usepackage[dvips, pdfnewwindow=true]{hyperref}
\hypersetup ...