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Please find an example attached for a simpler problem.
Dear Gokul, thanks a lot for reminding me of the existence of contexts! Needs["MultivariateStatistics`"] dist = System`MultinormalDistribution[{0, 0}, {{1.7632655763946026`, -1.6637745757032427`}, \ ...
Del is a function, that has to act on something. If it does not, it will give an error. You can circumvent this behavior by typing it as a string: TeXForm["\[Del]"] \nabla