You should probably wait and upgrade to version 3.7 the site plugin, as mentioned here .
Looks like you are facing something similar to # MSITE-796
Further quote from the same link: -
The release will take a little longer due to the expectation of the SNAPSHOT dependency, which should be released first. Therefore, either a little more patience or add doxia-sitetools 1.7.5 as a dependency to the maven-site plugin in your own project.
<dependency> <groupId>org.apache.maven.doxia</groupId> <artifactId>doxia-sitetools</artifactId> <version>1.7.5</version> </dependency>
-edit -
Since doxia-sitetools is just a pom container project, you must immediately update all its modules:
<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-site-plugin</artifactId> <version>3.6</version> <dependencies> <dependency> <groupId>org.apache.maven.doxia</groupId> <artifactId>doxia-decoration-model</artifactId> <version>1.7.5</version> </dependency> <dependency> <groupId>org.apache.maven.doxia</groupId> <artifactId>doxia-skin-model</artifactId> <version>1.7.5</version> </dependency> <dependency> <groupId>org.apache.maven.doxia</groupId> <artifactId>doxia-integration-tools</artifactId> <version>1.7.5</version> </dependency> <dependency> <groupId>org.apache.maven.doxia</groupId> <artifactId>doxia-site-renderer</artifactId> <version>1.7.5</version> </dependency> <dependency> <groupId>org.apache.maven.doxia</groupId> <artifactId>doxia-doc-renderer</artifactId> <version>1.7.5</version> </dependency> </dependencies> </plugin>
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