failed to find Build Tools revision 21.1.1 – sdk up to date

What worked for me was:

android list sdk -a

Which showed me the following list:

1- Android SDK Tools, revision 24.0.2
2- Android SDK Platform-tools, revision 21
3- Android SDK Build-tools, revision 21.1.2
4- Android SDK Build-tools, revision 21.1.1
5- Android SDK Build-tools, revision 21.1
6- Android SDK Build-tools, revision 21.0.2
7- Android SDK Build-tools, revision 21.0.1
... and a great many more

Followed by the command:

android update sdk -a -u -t 3

The “3” in the command refers the the index listed in the output of the first command.

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