Hi,

The reason for this error is that the field ‘x_studio_is_an_end_user’ is removed automatically when you uninstall that module. Every customization we add through the studio will be automatically removed once we uninstall or upgrade that module. It is always better to add new fields or new customization through code.

For solving these issues, you need to add the same field again. Or you need to remove the code that used the field ‘x_studio_is_an_end_user’.

Regards