Plugin updated for 0.6.0, use version 0.1.0 of the plugin, have updated the embedded media too to match their redesign.
Getting this on the 2 new feeds I just added:
2018-08-08T01:52:06.375Z  - info: [plugin-rss] posting, https://threatpost.com/category/vulnerabilities/feed - title: Podcast: Breaking Down the COSCO Ransomware Attack, published date: 2018-08-02T15:44:34Z 2018-08-08T01:52:06.437Z  - error: message=[[error:too-many-tags, 5]], stack=Error: [[error:too-many-tags, 5]]
In your ACP at
/admin/settings/tags increase the maximum tag count, it seems that feed item has more than 5 tags.