General ⇒ LaTeX Error: Command \AtBeginEnvironment already defined

[manojg]

Hi,

I wanted to use mdframed for text shadow. After installing it, it required me to install l3packages, l3kernel, l3experimental and etoolbox. However, after installing etoolbox packages, I got following error:

Code: Select all

 LaTeX Error: Command \AtBeginEnvironment already defined.
               Or name \end... illegal, see p.192 of the manual.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.1657   \csgappto{@begin@#1@hook}}

I am sure it is a conflict between two packages but I don't know how to fix this. Any suggestion?

Thanks.

[Stefan Kottwitz]

I am sure it is a conflict between two packages

That's possible. While installed packages don't matter, it's important which packages you load in your document. So check your document preamble, or post it here. We could see the packages then. Usually, it's a good idea to post a minimal working example which produces the error.

Stefan