studio.sh Error: Could not find or load main class com.intellij.idea.Main on linux

My linux is 64-bit Kubuntu 15.04.
I downloaded ideaIC-14.1.4.tar.gz and unzipped to ~.
I downloaded android-studio-ide-141.2178183-linux.zip and unzipped to ~.

$ java -version
java version "1.7.0_79"
OpenJDK Runtime Environment (IcedTea 2.5.6) (7u79-2.5.6-0ubuntu1.15.04.1)
OpenJDK 64-Bit Server VM (build 24.79-b02, mixed mode)

I modified the ~/android-studio/bin/idea.properties file as follows:
idea.config.path=~/idea-IC-141.1532.4
idea.system.path=~/idea-IC-141.1532.4
idea.plugins.path=${idea.config.path}/plugins

~/android-studio/bin$ studio.sh
Error: Could not find or load main class com.intellij.idea.Main