Why do you guess that? Do you have the module installed? Did you follow the guide without any problems?
The guide of texvc tells this
texvc in its turn requires three additional programs, ocaml, LaTeX and dvipng. These three programs do not come with the distribution of mediawiki.
Texvc requires some other programs to work and those programs are't Bitnami products. You can install them using the packages for your system.
Don't hesitate to write us back if you have any more questions about the Bitnami products.