This android sdk requires adt version 21.1.0 or above error in eclipse

This error occurred to me too. I tried to update my SDK version using my SDK manager previous day and when I tried to use my eclipse after the api got downloaded, it threw the error. €œThis android sdk requires adt version 21.1.0 or above error in eclipse. Please update your ADT to 21.1.0 for SDK 21.1.0€. If you try to run your project ignoring this error, you will get an error saying €œyour projects are found to have errors€. But it would have run perfectly before updating. Below is the preferences window showing error €œAndroid SDK requires ADT 21.1.0 or above. Please update ADT€. The solution for this problem is simple and is given below.

Preferences –> Android Window:

Projects in Project explorer:

Solution:

In such cases the simple thing search for the required ADT 21.1.0 in my case (Previous version – 21.0.0) and install the plug-in to your eclipse. To do so, follow the below steps,

• Go to Help –>  Install software
• Click on Add at the right top
• Give your ADT plug-in name and the URL location for it in the add repository window.

(OR)

• You can download the ADT version you want as a zip file.
• Then click on Archive in the add repository window and browse your zip file and give it. Mention your adt plug-in name as well.
• Now click on OK. Window as shown below appears below.

• Select Developer plugins option and click on Next to calculate your dependencies.
• Accept the agreement and click on finish to install plug-in successfully. Once this is over, eclipse will prompt to restart it.

• Click on OK to restart.
• Now your SDK preferences are retained as it was before without error. Now the projects are available without error.