gallery import addon does not run

addon/gallery/import>

1) First failure due to: Failed to load class org.slf4j.impl.StaticLoggerBinder
2) Replaced slf4j-log4j12 by slf4j-jdk14 in pom, to prevent same name class.
3) mvn exec:java

[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Exception during program execution

hipporepository