[Plugin: Flexo Archives] Minor errors: undefined properties, uninstall hook

Version 2.1.5 has some minor errors. No big deal, but I wonder if the uninstall hook issue might affect uninstalling in future versions of WordPress, and the undefined properties are easy to fix. I really like this plug in, thanks for writing it.

Notice: Undefined property: FlexoArchives::$OPT_YRCOUNT_STANDALONE in [...]\wp-content\plugins\flexo-archives-widget\flexo_archives_widget.php on line 111
Notice: Undefined property: FlexoArchives::$OPT_YRCOUNT in [...]\wp-content\plugins\flexo-archives-widget\flexo_archives_widget.php on line 112
Notice: Undefined property: FlexoArchives::$OPT_YRCOUNT_STANDALONE in [...]\wp-content\plugins\flexo-archives-widget\flexo_archives_widget.php on line 124
Notice: register_uninstall_hook was called incorrectly. Only a static class method or function can be used in an uninstall hook.

https://www.ads-software.com/extend/plugins/flexo-archives-widget/