Dear List!
I have tried:
\starttext
{This is me}
\startMPcode
input mptrees;
u:=0.4cm;
dirlabel:=90;
abscoord:=true;
endlabelspace:=0.5cm;
draw startlabel("$S$");
draw tree[1][1]((-5.5u,4u),(5.5u,8u))("NP","","VP","");
\stopMPcode
\stoptext

But there is a mistake, i dont know where, and whats wrong. After compiling (I have WinEdt as Editor), with Context, got wrong, I tried it with mp.exe, i get the following warning:

Command Line:   C:\Users\Hermann\Downloads\context-mswin\tex\texmf-mswin\bin\context.exe --synctex=-1 "context-test.tex"
Startup Folder: C:\Users\Hermann\My Documents

mtx-context     | run 1: luametatex --fmt="C:/Users/Hermann/Downloads/context-mswin/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en" --jobname="context-test" --lua="C:/Users/Hermann/Downloads/context-mswin/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en.lui" --c:currentrun=1 --c:fulljobname="./context-test.tex" --c:input="./context-test.tex" --c:kindofrun=1 --c:maxnofruns=9 --c:synctex="-1" --c:texmfbinpath="C:/Users/Hermann/Downloads/context-mswin/tex/texmf-mswin/bin" "cont-yes.mkiv"

This is LuaMetaTeX, Version 2.00.0
open source     > level 1, order 1, name 'cont-yes.mkiv'
system          >
system          > ConTeXt  ver: 2019.10.04 17:53 MKIV beta  fmt: 2019.10.7  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 'context-test', input './context-test', result 'context-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 './context-test.tex'
fonts           > preloading latin modern fonts (second stage)
fonts           > 'fallback modern-designsize rm 12pt' is loaded
metapost        > initializing instance 'metafun:1' using format 'metafun' and method 'default'
metapost        > loading 'metafun' as 'C:/Users/Hermann/Downloads/context-mswin/tex/texmf-context/metapost/context/base/mpiv/metafun.mpxl' using method 'default'
metapost        > initializing number mode 'scaled'
metapost log    >
metapost log    > loading metafun, including plain.mp version 1.004 for metafun iv and xl
metapost log    >
mplib warning: table expected from 'open_file'
mtx-context     | fatal error: return code: -1073741819
Best regards
Uschi Hermann
PS: I have done the beta version of cont-tmf today , and have installed context-mswin, what I do every week.
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ConTeXt Compilation Report (Pages: 0)

Errors: 0   Warnings: 0   Bad Boxes: 0