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I typed:

\begin{tikzcd}
    E \arrow[r] E 
\end{tikzcd}

and I get the error "No shape named tikz@f@1-1-2 is known." I have tried many things and don't know how to fix this.

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The syntax of tikz-cd requires nodes to be separated by the & symbol. Here's a minimal document. For future questions, it's really helpful (and usually essential) to add such a document to your question (even if it yields an error.) See I've just been asked to write a minimal example, what is that?.

\documentclass{article}

\usepackage{tikz-cd}
\begin{document}
\begin{tikzcd} E \arrow[r] & E \end{tikzcd}
\end{document}

output of code

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