When I try to add any math to my page, it displays this error:

Failed to parse (Missing <code>texvc</code> executable. Please see math/README to configure.): E=P \Delta V

(E=P \Delta V was what I wanted to render as math.) I have global preferences set to render math as PNG, not MathML. This also happened when I modified a previously-rendered equation.

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Even if I changed the Math Source as LaTeX Source (using preference), math formula is still broken.