Failed to get the required ADT version number from the SDK

Failed to get the required ADT version number from the SDK

The Android Developer Toolkit may not work properly.

Solution：

You can download your adt from Eclipse Marketplace or Install New Software otherwise you can also specify the adt installed directory.

Here we are going to see about the Eclipse Marketplace.

Select Help-> Eclipse Marketplace

and then type adt and then install the adt plugin.