Context: I'm doing a poster using `tikzposter`. Also I'm on ShareLatex, I suspect it might be source of the problem as well.

Problem: I can't add a theorem, this is simply ignored when I compile. Here is a sample: 

First: 

```
  \documentclass[18pt, a0paper, portrait, noamsthm]{tikzposter}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amsthm} 
\usepackage{hyperref}
\newtheorem{definition}{Definition}
\newtheorem{theorem}{Theorem}
\usepackage{tikz-cd}
\usepackage{etoolbox}
\patchcmd{\thebibliography}{\section*{\refname}}{}{}{}
\newcommand{\g}{\mathfrak{g}}
\newcommand{\h}{\mathfrak{h}}
\renewcommand{\b}{\mathfrak{b}}
\newcommand{\N}{\mathcal{N}}
\newcommand{\NN}{\tilde{\mathcal{N}}}
\newcommand{\C}{\mathbb{C}} 
\title{Talk}
\author{Nicolas Hemelsoet}
\date{\today}

\usetheme{Simple}

\begin{document}

\maketitle

\block{test}{
\begin{theorem}
Hi
\end{theorem}
}

\end{document}

```

For the first code, I got this answer: 

> 
> There are no entries found in a list you have created. Make sure you label list entries using the `\item` command, and that you have not used a list inside a table.
> 
> 
> 

Any help is really appreciated, many thanks in advance !