I am using following set of packages for my LaTeX file but I am getting following error.

! LaTeX Error: Option clash for package placeins.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
... \begin`

The packages which I am using are

\documentclass[twocolumn]{svjour3}          % twocolumn
 \smartqed  % flush right qed marks, e.g. at end of proof
 \usepackage{graphicx, subfigure}

Which two packages are in conflict?


The two packages conflicting are really one, since you load placeins twice, first without options and then with section option and this will produce the clash. Delete the one of the two lines loading the package (depending on whether you need or not the section option).

You could have discovered this by yourself had you typed h (for help) in the output console when the error appeared. After h + return you would get:

? h
The package placeins has already been loaded with options:
There has now been an attempt to load it with options
Adding the global options:
to your \documentclass declaration may fix this.
Try typing  <return>  to proceed.

Also, not in the question, but you are loading the obsolete subfigure package. Use subfig (which you are already loading) or subcaption instead.

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