cannot use geometry manager grid inside .!toplevel which already has slaves managed by pack

This error occurs when you try to use both pack and grid geometry managers in the same parent widget. In Tkinter, you can only use one geometry manager at a time for a given parent widget.

To fix this error, choose one geometry manager and use it consistently throughout your code. If you want to use grid, remove any pack statements and replace them with grid statements. If you want to use pack, remove any grid statements and replace them with pack statements.

If you need to use both grid and pack in the same program, you can create separate frames for each geometry manager and then pack or grid those frames inside the parent widget. This way, each frame can use its own geometry manager without conflicting with the other frames.