[Plugin: WP-Lifestream2] Can't add a twitter feed

When I try to add my twitter feed to lifestream I get the following error:

There were errors with your request:

Error fetching feed from https://twitter.com/statuses/user_timeline/marktuma.rss?page=1&count=20&source=twitterandroid (A feed could not be found at )....

<?xml version="1.0" encoding="UTF-8"?>
<hash>
<error>Rate limit exceeded. Clients may not make more than 150 requests per hour.</error>
<request>/

Is this just me, or is it a known thing? Is there anything I can do about it?

Thanks for a great plugin!

https://www.ads-software.com/extend/plugins/wp-lifestream2/