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You get this error because you forget to add required JARs into the application classpath (sidenote: this is happening when you do not use Maven).
Q: How to solve it?
A: Add required JARs into the classpath.
Q: Where to find required JARs?
A: In the ZIP file in libs directory, as described on the project main page.
libs
More details can be found here:
How to solve java.lang.ClassNotFoundException: org.slf4j.LoggerFactory