What am I doing wrong here, please? 

\starttext
\frac{1}{2}
\stoptext

gives

tex error       > tex error on line 2 in file ./tt.tex: Missing $ inserted

<inserted text> 
    
    $\mathatom 
<macro> \math_atom_by_parameter_indeed 
    #1->\mathatom 
    \s!class \mathcodechecked {#1}
<macro> \math_frac 
    ...meter #2\or \setupcurrentmathfraction [#2]\fi \edef 
\p_math_fraction_fences {\mathfractionparameter \c!fences }\dostarttagged 
\t!mfractionstack {\mathfractionparameter \c!mathmeaning 
}\math_atom_by_parameter \mathfractionparameter 
    \bgroup \ifem ...
<to be read again> 
    
    {
<line 3.2> 
    \frac{
    1}{2}

1     \starttext
2 >>  \frac{1}{2}
3     \stoptext
I've inserted a begin-math/end-math symbol since I think you left one out.
Proceed, with fingers crossed.
mtx-context     | fatal error: return code: 1

—
Bruce Horrocks
Hampshire, UK

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