B4J Question [ABMaterial] ABJasperReportsDemo running error

[springer kow]

HI,
I downloaded ABJasperReportsDemo and run it, it showed the following error:
log4j:WARN No appenders could be found for logger (com.mchange.v2.log.MLog).
log4j:WARN No appenders could be found for logger (com.mchange.v2.log.MLog).
and the app stopped.
I use B4J 5.9 and ABMaterial 4.25
Could tell me how to solve it.

Thanks

Kow