PYTHON : Why am I getting "LinAlgError: Singular matrix" from grangercausalitytests?

PYTHON : Why am I getting "LinAlgError: Singular matrix" from grangercausalitytests?
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PYTHON : Why am I getting "LinAlgError: Singular matrix" from grangercausalitytests?
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am from grangercausalitytests? PYTHON Why Singular "LinAlgError: matrix" getting : I