I am using eclipse Kepler version and trying to install Sonar plugin from Eclipse marketplace. But I am getting below error
Cannot open Eclipse Market
I have tried all the possible suggestions given above but finally got answer for this : This may not be the right way to install the plugin but it worked for me and it served my purpose
Open the below URL : http://marketplace.eclipse.org/marketplace-client-intro?mpc_install=252148
Open eclipse and drag the plugin from the above url drop on eclipse [on top near header]
It will start downloading and eclipse will restart after successful installation.