I had a problem with a new machine with MacOS High Sierra.
After installing Android Studio and the latest version of the SDK / SDK Tools, I could not create AVD from Android Studio (the button greyed out, no option under Tools
) or launch the AVD manager in any other way.
I tried the same thing the OP did, and then noticed that I got the following error: Gradle sync failed: Failed to find Build Tools revision 26.0.2
From the event log I followed the link to download the Build tools, and now it works!
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