Cannot assign keyboard shortcut to Readibility for Chrome

Question

Readability is a very convenient plugin for Chrome. I can reformat the page or send the page to Kindle.

When I reinstall the Chrome browser, I can neither use the keyboard shortcuts nor assign shortcut for it.

When I click on the box and press some shortcuts, such as ctrl-shift-k, nothing happened.

How to solve this problem?

Answer 1

Problem solved by reinstall Readability.

The reason I leave this question without deleting it is for other's reference - maybe someone come across the same problem someday - he doesn't need to ask again.