session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Install, operand=null --> [R]net.sf.fjep.fatjar 0.0.31, action=).
Failed to prepare partial IU: [R]net.sf.fjep.fatjar 0.0.31.
解決辦法：
go to Help -> Install New Software..., choose "The Eclipse Project Updates - http://download.eclipse.org/eclipse/updates/4.4" from the "Work with" list and then in the "Eclipse Tests, Examples, and Extras" category check "Eclipse 2.0 Style Plugin Support" and install it. After restarting Eclipse, install veloeclipse again and this time the installation will succeed.
說明：
4.4 根據你eclipse版本變化
參考：
http://blog.csdn.net/wonder4/article/details/39778013