[Tex/LaTex] Bibliography doesn’t work -> missing item

bibliographies

My bibliography of my tex document doesn't work and I can't find out why.
I created 2 books in bibTex, but if I refer to them via

 %%% Main Document
    \bibliography{Seminar}
    \begin{thebibliography}
    \bibitem[Knuth98]{ComProgram} \emph{The Art of Computer Programming}
    \end{thebibliography}

The compiler says missing item on these lines. I did it just as in the tutorial in which I found these lines. The bib file is also in the same folder as the document.
I found many tutorials on google but I just don't seem to get it.

Best Answer

The problem is the missing argument to thebibliography, which specifies the widest label:

\begin{thebibliography}{Knuth98}

Note. If you are using directly the thebibliography environment, the \bibliography command is useless.

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