color package and float package collision

Question

I'm writing a document and I wanted to colour some text parts.

In the preamble I call float package and many others and it worked properly. until I called color package. Then LaTeX return errors at some place in the source code:

Missing \endgroup inserted
Missing } inserted
Unbalanced output routine ...

By (un)commenting parts of code I've found that \newfloat{graf}{tbp}{lop}[chapter] command causes it.

Does anyone have idea why it is working only without color package and/or how to define custom floats and be able to use colours?

Thanks for your time and suggestions.

Edit:

Code:

\documentclass[a4paper%,draft%
    ,12pt]{report}
\usepackage[cp1250]{inputenc}
\usepackage[english,czech]{babel}
\usepackage{float}
\usepackage[usenames,dvipsnames]{color}

\newcommand{\dd}{\ensuremath{\mathrm{d}}}

%== Graf environment definition==

\newfloat{graf}{tbp}{lop}[chapter]
\floatname{graf}{Graf}
\newcommand{\listofgraphs}{\listof{graf}{List of Graf}}

\begin{document}

Lorem ipsum dolor sit amet.

\end{document}

Answer 1

Ok...

Mistake was between chair and screen. As usual.

The problem is not in collision between those packages, problem is caused by the name of my new float - graf - and its collision with color package. When I used

\newfloat{foo}{tbp}{lop}[chapter]

No error was throwed.

Axel:

I've tried the floatrow package and changed proper commands but same error occurs, so Your advice led me to this conclusion. Thanks.

Answer 2

In the course of defining a new floating environment called graf, you will (among other things) define the macros \graf and \endgraf. The latter will cause an error because the \endgraf macro is already defined as \par by LaTeX (and plain TeX).