PHP notices

Hello,

I’m getting all kinds of PHP notice:

Notice: Undefined variable: category in …\wp-content\plugins\post-expirator\post-expirator.php on line 1284
Notice: Trying to get property of non-object in …\wp-content\plugins\post-expirator\post-expirator.php on line 1284
Notice: Undefined variable: category in …\wp-content\plugins\post-expirator\post-expirator.php on line 1285
Notice: Trying to get property of non-object in …\wp-content\plugins\post-expirator\post-expirator.php on line 1285
Notice: Undefined variable: category in …\wp-content\plugins\post-expirator\post-expirator.php on line 1285
Notice: Trying to get property of non-object in …\wp-content\plugins\post-expirator\post-expirator.php on line 1285
Notice: Undefined variable: category in …\wp-content\plugins\post-expirator\post-expirator.php on line 1285
Notice: Trying to get property of non-object in …\wp-content\plugins\post-expirator\post-expirator.php on line 1285
Notice: Undefined variable: category in …\wp-content\plugins\post-expirator\post-expirator.php on line 1285
Notice: Trying to get property of non-object in …\wp-content\plugins\post-expirator\post-expirator.php on line 1285
Notice: Undefined variable: category in …\wp-content\plugins\post-expirator\post-expirator.php on line 1285
Notice: Trying to get property of non-object in …\wp-content\plugins\post-expirator\post-expirator.php on line 1285

Notice: Undefined index: taxonomy in …\wp-content\plugins\post-expirator\post-expirator.php on line 891
Select the hierarchical taxonomy to be used for “category” based expiration

Any help is appreciated. Thanks.

https://wordpress.org/plugins/post-expirator/