Stacking table or timetable variables is not supported. Use SPLITVARS to split ''{0}'' into multiple variables. The set of variables to stack must not contain any variables that are also specified as constants. The index variable name ''{0}'' conflicts with other variable names in the result. The data variable name ''{0}'' conflicts with other variable names in the result. The new data variable names conflict with other variable names in the result. Error when stacking data variable ''{0}''. All groups of variables to stack must be the same size. Stacking table row names not supported. Create a table containing those row names as a variable. The variable names '<undefined>' or '<missing>' cannot be indicator values in the stacked table, because they are not allowed as categorical values to avoid ambiguity with <undefined> categorical data. Modify the variable name prior to calling stack. The index variable name must be a non-empty character vector or scalar string. Specify {0} variable names for {0} stacked data variables using the NEWDATAVARIABLENAME name-value pair. New data variable names should be empty when there are no variables to stack. Indicator variable name should be empty when there are no variables to stack. The input argument that specifies the set of variables to stack must be constant. The ''ConstantVariables'', ''NewDataVariableNames'', and ''IndexVariableName'' arguments must be constant.