java.lang.IllegalStateException: org.slf4j.LoggerFactory in failed state

[gmseed]

Hi

I downloaded your DemoView/StandardExample and pasted them into an app to see PrefFX working. On running the application I get a slf4j exception:

Caused by: java.lang.IllegalStateException: org.slf4j.LoggerFactory in failed state. Original exception was thrown EARLIER. See also http://www.slf4j.org/codes.html#unsuccessfulInit
at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:422)
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)
at com.dlsc.preferencesfx.model.Setting.(Setting.java:51)
... 48 more
...

and a related exception:

Exception in thread "JavaFX Application Thread" java.lang.NoClassDefFoundError: Could not initialize class com.dlsc.preferencesfx.model.Setting
at appPreferences.prefsfx.StandardExample.createPreferences(StandardExample.java:86)
...

which stems from:

Setting.of("Orientation", orientationItems, orientationSelection)

Is there some additional setup required?

What if I'm using my own logger? Will that interfere the one used by PrefFX?

Thanks.
Graham