Solution 19849: Error "Invalid input" When Naming a Column with the Same Name as a Stored Variable on the TI-Nspire™ Family.
Why does the TI-Nspire family handheld display the error "Invalid input" when naming a column with the same name as a stored variable?
The Lists & Spreadsheets application on the TI-Nspire family handheld allows the user to 'name' a column, thereby associating its contents with the chosen name. If the name corresponds to an already defined variable, the handheld will display the error "Invalid input".
If this occurs, simply choose a different name for the column.Please see the TI-Nspire family guidebooks for additional information.