Sonar lint plugin installation failed
I'm using STS 4.12.0.RELEASE and try to install sonar lint 6.1 plugin from eclipse market place. But received java.lang.IllegalStateException: operation plan must be resolved as the attached image.
Is there any alternative way to install the sonar lint plugin?
Added additional image about failure message 
Solution
The installation of the SonarLint plugin from the marketplace works for a fresh STS 4.12.0 distribution in general, so this might be a network glitch, stale cached data from the update site, or something in this area.
I would recommend to go to the Preferences -> Install/Update -> Available Update Sites and remove (not just disable) the update site for SonarLint in there, restart, and try again.
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