I deleted the Android SDK Build Tools-35 and installed them again and the error got removed. This is what you've to do:

Go to SDK Manager in Android Studio. Choose the tab 'SDK Tools'. If the Android SDK Build Tools will already be selected, it mean you've already downloaded them and you've to delete them and install them again. So uncheck that option, then click apply and okay. Then go to the same tab and this time, check the option "Android SDK Build Tools" and then click on apply. It will start downloading the Android SDK Build Tools for you.

PS. Restart your PC after doing this if the error will not be resolved. Also, run the command prompt as administrator.

Good Luck!