https://bugzilla.redhat.com/show_bug.cgi?id=1226926
--- Comment #6 from gil cattaneo puntogil@libero.it --- (In reply to Sopot Cela from comment #5)
Thank you for the prompt suggestoins.
(In reply to gil cattaneo from comment #3)
(In reply to gil cattaneo from comment #1) Seem you have duplicate tycho-maven-plugin entries in the main pom file ... is not a good idea ...
Fixed: https://sopotc.fedorapeople.org/eclipse-e4-importer/eclipse-e4-importer.spec
Sorry but you maybe use '${tycho-version}' (with single quotation mark) otherwise you must use ${tycho-version} as global variable, because the version of this plugin maybe remain empty