The first two inputs must be tables. Cannot find a common table variable to use as a key variable. Must provide either the ''Keys'' parameter, or both the ''LeftKeys'' and ''RightKeys'' parameters. Must provide either the ''Keys'' parameter, or both the ''LeftKeys'' and ''RightKeys'' parameters. The ''KeepOneCopy'' parameter must be a variable name or a cell array containing variable names. The number of key variables on the left and right must be the same. Cannot include a variable twice. An N-D variable cannot be used as the key for a join. Left and right key variables ''{0}'' and ''{1}'' do not have the same number of columns. Left and right key variables ''{0}'' and ''{1}'' are not comparable because one is a non-cell. Left and right key variables ''{0}'' and ''{1}'' have incompatible types. Merging keys with different types to create the variable ''{0}'' in the output table resulted in a conversion error.\n A {0} variable cannot be used as the key for a join if it has multiple columns. The key variable for the right table must have unique values. The key variable for the right table must contain all values in the key variable for the left table. The key variables for the right table must contain all unique combinations of values in the key variables for the left table. The key variables cannot contain any missing values. TYPE must be ''left'', ''right'', or ''full''. Left and right key variables ''{0}'' and ''{1}'' include cells containing non-character vector values. Error when finding unique values for left and right key variables ''{0}'' and ''{1}'':\n{2}. Unable to find rows in the right table corresponding to those in the left table using the key variables. The ISMEMBER method generated the following error:\n\n{0} Unable to find rows in the right table corresponding to those in the left table using the key variables. The value returned by the ISMEMBER method had the wrong number of rows. The right table must contain all of the left table's row names when using row names as the key. To join a timetable and a table, the first input must be the timetable and the second input must be the table. Row names are not supported in ''LeftVariables'' or ''RightVariables''. Unrecognized variable name ''{0}''. You may have intended to access the row names, which are named ''{1}'' in this table. However, row names are not supported in ''LeftVariables'' or ''RightVariables''. Inner or outer joins between tables, using row names as the left key and a variable as the right key, are not supported. Convert the row names to a variable in the left input. To join a table and a timetable, the timetable must be the first input. Outer joins between tables, using row names in combination with other keys, are not supported. Use only the row names as the key, or convert the row names to variables in the inputs. ''{0}'' must be constant. Code generation does not support non-key variables with the same name. Code generation for outerjoin does not support key variables with the same name unless ''MergeKeys'' is set to true. Code generation for join does not support table or timetable keys or variables. Use SPLITVARS to split ''{0}'' into multiple variables.