Eclipse Community Forums: Newcomers » Build [ERROR] Invalid extension descriptor for org.eclipse.tycho:tycho-maven-plugin:0.20.0
![Maven Error Could not initialize class org.apache.maven.plugin.war.util.WebappStructureSerializer - YouTube Maven Error Could not initialize class org.apache.maven.plugin.war.util.WebappStructureSerializer - YouTube](https://i.ytimg.com/vi/DrdVahiLb5w/maxresdefault.jpg)
Maven Error Could not initialize class org.apache.maven.plugin.war.util.WebappStructureSerializer - YouTube
![🦉 Apache Maven on Twitter: "With great pleasure we can announce the first set of four actioncards that you can add to your social media. A huge THANK YOU to @tomitribe for 🦉 Apache Maven on Twitter: "With great pleasure we can announce the first set of four actioncards that you can add to your social media. A huge THANK YOU to @tomitribe for](https://pbs.twimg.com/media/EpDKpaHXcAAF--D.jpg)
🦉 Apache Maven on Twitter: "With great pleasure we can announce the first set of four actioncards that you can add to your social media. A huge THANK YOU to @tomitribe for
![java - Could not transfer artifact (https://repo.maven.apache.org/maven2): Received fatal alert: protocol_version -> [Help 1] - Stack Overflow java - Could not transfer artifact (https://repo.maven.apache.org/maven2): Received fatal alert: protocol_version -> [Help 1] - Stack Overflow](https://i.stack.imgur.com/0vFuI.png)
java - Could not transfer artifact (https://repo.maven.apache.org/maven2): Received fatal alert: protocol_version -> [Help 1] - Stack Overflow
![Solved] Could not transfer artifact org.springframework:XYZ from/to central (https://repo.maven.apache.org/maven2) | Facing Issues On IT Solved] Could not transfer artifact org.springframework:XYZ from/to central (https://repo.maven.apache.org/maven2) | Facing Issues On IT](https://facingissuesonitcom.files.wordpress.com/2019/05/maven-force-update-2.jpg?w=640)