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What does the following error mean:

error in specification of innovations or responses in "DO_test_1A.decomp (100, m, imp=chol, se=mc, rep=100) A B C D E F G H".

I'm attempting to freeze a VAR variance decomposition

You have a space between the decomp command and its options. If that doesn't fix it, ensure that the var contains the series A, B, C, D, E, F, G and H.