traccar server

hello. i try to build traccar server. 4.13
I download source from git, and build using ./gradlew assemble. file jar appeare from target file and i copy jar file to server test but error server cannot run.
I try build using mvn but getting error no pom file there on 4.13 source or 4.14

what command to build that server jar?

error come from build using ./gradlew assemble

        at org.traccar.Main.<clinit>(Main.java:35)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
        ... 1 more

What version did you have installed originally? You have to have a matching version. Based on your error message, it looks like you are not using matching version.