Input graphs must both be undirected or both be directed. No value given for ''{0}'' parameter. Parameter name must be ''NodeVariables'' or ''EdgeVariables''. ''{0}'' value must be a string vector, a character vector, or a cell array of character vectors. Datatype mismatch in node variable {0}, datatype is ''{1}'' in first graph, but ''{2}'' in second graph. Datatype mismatch in edge variable {0}, datatype is ''{1}'' in first graph, but ''{2}'' in second graph. No node variable {0} in first graph. No node variable {0} in second graph. No edge variable {0} in first graph. No edge variable {0} in second graph. Size mismatch in node variable {0}. Node variables in input graphs must have the same size. Size mismatch in edge variable {0}. Edge variables in input graphs must have the same size.