Membership2 Pro error on activate

Mac OS X Install 10.10.3 Yosemite

In my Network dashboard I saw, “upgrade to Membership2 Pro”. … I did that.

Then, I went to Network to activate the plugin, now I get this error.

Abborting update of Protected Content! Could not create a restore-point [1]

Unable to create directory wp-content/blogs.dir/1/files/2015/06. Is its parent directory writable by the server?