manually overrid the java heap size:
> In Xamarin Studio:
> Right-click on Project
> Options
> Android Build
> Advanced
> Set Java Heap Size to 1G
And This also helped to me
ref - https://forums.xamarin.com/discussion/comment/230873/#Comment_230873
downloaded the proguard file and unzip it
url to download file
https://sourceforge.net/projects/proguard/files/proguard/4.6/
go to this location:
C:\Users\yourUsername\AppData\Local\Android\android-sdk\tools
here you will find proguard folder rename it to proguard.old
and paste the downloaded unzip folder(folder with name proguard) there
inside the tools folder. rebuilt and run project,
after doing this if you won't get the solution do the last step also
last step is: open the proguard.old folder copy all files from here
and paste in the proguard folder(skip the same files if you get the
warning)
Note :Everything you need to do inside this location only
C:\Users\yourUsername\AppData\Local\Android\android-sdk\tools
Read this article for learn more - https://developer.xamarin.com/guides/android/deployment,_testing,_and_metrics/release-prep/proguard/