@andregp, can you share errors from the dblog instead of the console. You sho...

@andregp, can you share errors from the dblog instead of the console. You should find it at /admin/reports/dblog or from the toolbar "Reports" -> "Recent Log messages".

And the error is as designed. You need to manually delete the field before uninstalling the module. This is the behaviour with all modules that provide a field type.