I had the same problem with me ... I could not get the Indigo Marketplace Client to install, so I had to switch to the Helios repository and install it. It was installed, but running it gave me the same error message you received. I had to go back to Indigo and install (upgrade) on that one, and then everything worked.
Click "Help" → "Install New Software" → "Add" and add it: http://download.eclipse.org/mpc/indigo/
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