Hello everyone!

I have:
\usemodule{tikz}

\starttext
\starttikzpicture
node {root}
child {node {left}}
child {node {right}
child {node {child}}
child {node {child}}
}
\stoptikzpicture
\stoptext

Then after compiling I have the following mistake:

Command Line:   context.exe --synctex=-1 "picture test.tex"
Startup Folder: C:\Users\Hermann\Downloads\context-mswin\tex\texmf-context\doc\context\sources\general\manuals\nodes


resolvers       | formats | executing runner 'run luametatex format': C:/Users/Hermann/Downloads/context-mswin/tex/texmf-mswin/bin/luametatex --jobname="picture test" --fmt=C:/Users/Hermann/Downloads/context-mswin/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en.fmt --lua=C:/Users/Hermann/Downloads/context-mswin/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en.lui cont-yes.mkiv --c:currentrun=1 --c:fulljobname="./picture test.tex" --c:input="./picture test.tex" --c:kindofrun=1 --c:maxnofruns=9 --c:synctex="-1" --c:texmfbinpath="C:/Users/Hermann/Downloads/context-mswin/tex/texmf-mswin/bin"
This is LuaMetaTeX, Version 2.01.0
open source     > level 1, order 1, name 'cont-yes.mkiv'
system          >
system          > ConTeXt  ver: 2019.11.13 00:08 MKIV beta  fmt: 2019.11.27  int: english/english
system          >
system          > 'cont-new.mkiv' loaded
open source     > level 2, order 2, name 'C:/Users/Hermann/Downloads/context-mswin/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv'
system          > beware: some patches loaded from cont-new.mkiv
close source    > level 2, order 2, name 'C:/Users/Hermann/Downloads/context-mswin/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv'
system          > files > jobname 'picture test', input './picture test', result 'picture test'
fonts           > latin modern fonts are not preloaded
languages       > language 'en' is active
system          > synctex functionality is enabled, expect 5-10 pct runtime overhead!
open source     > level 2, order 3, name './picture test.tex'
fonts           > preloading latin modern fonts (second stage)
fonts           > 'fallback modern-designsize rm 12pt' is loaded

tex error       > tex error on line 5 in file ./picture test.tex: ! Undefined control sequence

l.5 \starttikzpicture


1
 2     \usemodule{tikz}
3
 4     \starttext
5 >>  \starttikzpicture
 6     node {root}
7     child {node {left}}
8     child {node {right}
9     child {node {child}}
10     child {node {child}}
11     }
12     \stoptikzpicture
13     \stoptext


The control sequence at the end of the top line of your error message was never
\def'ed. You can just continue as I'll forget about whatever was undefined.


mtx-context     | fatal error: return code: 1


_____________________________________________________________________

ConTeXt Compilation Report (Pages: 0)

Errors: 1   Warnings: 0   Bad Boxes: 0
What is the mistake here?

Many Thanks
Uschi