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I need some help in adding a VF page to my account page layout. I have installed the Account News Feed App (contains only 1 VF page) in my Sandbox Instance, however, I could not find the VF page section on the Edit Account page layout page.
Some old posts mentioned that we may need a standard controller in the code, and I found the following from the included VF page (I don't know much about VF coding....):
<apex:page standardController="account">
What could be the issue?

Thank you,
Sharing Rule Limit Exceeded 
Your organization has exceeded the maximum number of sharing rules allowed of this type. Please contact your administrator for more information. 

Can someone please point me to the Help Section where this limit is mentioned? Why can't I create more than 100 sharing rules on an object??? There's nothing in the app Setup limits page...nothing. It's obstructing the current project I am doing, so hope somebody of SF can help me work around this 1!
I'm doing the simple lightning components challenge and have hit this problem in my existing trailhead org and a brand new dev org that I've just created:

Challenge not yet complete... here's what's wrong: 
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: QVWBQHAG