Details
Description
I justed downloaded the 4.0rc10 source package. And since it includes Eclipse files .project and .classpath, I thought it was an Eclipse project, so I tried importing the sources.
But those files are outdated. The project's name is roller_30 and the classpath references several libraries, that are, according to the documentation, either no longer used or now used in a newer version.
I suggest deleting the files .project and .classpath.