Backend Error message when sharing post to LinkedIn

With Social Media Feather, I have chosen to give the reader the option to share my content via e-mail, Twitter, and Linkedin. On my first created post, all three buttons/emoticons took me exactly where they were supposed to. However, on the last two blog entries that have been published, the e-mail and Twitter buttons work, while the LinkedIn gives me a “Backend Error…” message.

Here’s a link to a post with the share buttons at the bottom:
http://personalinvesting.expert/2014/08/thigh-masters-bowflexs-robo-advisors/#more-76

and here’s the error message that pops up when attempting to share this blog post:

https://www.linkedin.com/shareArticle?title=Thigh+Masters%2C+BowFlexs%2C+%26+Robo-Advisors&mini=true&url=http%3A%2F%2Fpersonalinvesting%2Eexpert%2F2014%2F08%2Fthigh-masters-bowflexs-robo-advisors%2F

However, weirdly enough, our first blog post goes through just fine. Here’s a link to that:
https://www.linkedin.com/shareArticle?url=http%3A%2F%2Fpersonalinvesting%2Eexpert%2F2014%2F07%2Fira-rules-frustrate-charitably-inclined%2F&title=IRA+Rules+Frustrate+Charitably+Inclined&mini=true

Any insight would be appreciated. Thanks!

https://wordpress.org/plugins/social-media-feather/