Error: Could not find or load main class com.vaadin.server.themeutils.SASSA

Hi All,

Very new to Vaadin trying to get somebody else’s project working in my eclipse (downloaded from SVN). |Cannot get it to progress thorugh the mvn install. Build fails with the error;
Error: Could not find or load main class com.vaadin.server.themeutils.SASSAddonImportFileCreator

Went through forums and tried the suggestions.
mvn clean
mvn install -U
added compiler dependency.

Started a new example project - same issue.
My versions;

<jetty.plugin.version>9.3.9.v20160517</jetty.plugin.version>
<vaadin.version>8.4.5</vaadin.version>
<vaadin.plugin.version>8.4.5</vaadin.plugin.version>
<vaadin.widgetset.mode>local</vaadin.widgetset.mode>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>

Help appreciated.

Regards

Paul