Error in gradle build using Android Studio. (Gradle sync failed: The target server failed to respond)


I am using Android Studio 1.3 RC3 with Gradle 2.5.
Whenever I try to sync gradle, it gives the following error:

Gradle sync failed: The target server failed to respond
Consult IDE log for more details (Help | Show Log

I have noticed that this happens whenever I use “+” in calsspath. The following line gives error.

classpath “”

It works fine if I change this to

classpath ‘’

I am new to Gradle and I do not understand why am I getting this error. As far as I understand, “+” can be used whenever we want to use the latest version available.

Could anyone please help me understand this.