Hello list the whole error message I get is tex error > tex error on line 90 in file ./atestinminion-context.mkiv: Math error: parameter 'operatorsize' with id 8 in style 0 is not set \m_operator_text \endgroup \Ustopmathmode \m_operator_text \stopforceddisplaymath \egroup \ifcase \c_strc_formulas_frame_mode \else \strc_math_number_check_offsets \fi \ifcase \c_strc_formulas_frame_mode \strc_math_number_check \or \strc_math_number_check_outside \else \strc_math_number_check_inside \fi \str \m_operator_text \endgroup \strc_formulas_endstrut \stopinnermath \afterdisplayspace \egroup \m_operator_text \strc_formulas_place_number \strc_formulas_flush_number \dostarttagged \t!formulacontent \empty \dotagregisterformula \c_strc_formulas_n \csname \e!stop \formulaparameter \c!alternative \v!formula \endcsname \dostoptagged \dostoptagged \nonoindentati \stopformula \startformula \int_{\infty} >> \stopformula Sorry, but I can't typeset math unless various parameters have been set. This is normally done by loading special math fonts into the math family slots. Your font set is lacking at least the parameter mentioned earlier. What parameter is this referring to here? If I were to load sans it finishes off without errors on the math side, but then again, doesn't load sans at all mkiv lua stats > loaded fonts: 2 files: latinmodern-math.otf, minionpro-regular.otf And as you can guess, the above is not I was looking forward to -- Real computer scientists don't comment their code. The identifiers are so long they can't afford the disk space.