"class file has wrong version 48.0, should be 47.0"

[fiji kalathil]

Hi, 
 
i am using commons-net-1.4.0.jar in my proj 
 
i am getting the followinf compilation error
 
src/com/covad/ccbi/operations/InfBillingOps.java:5347: cannot access 
org.apache.commons.net.ftp.FTPClient
    [javac] bad class file: 
/home/fkp/DECEMBER-2005-dev/ccbi/lib/jakarta/commons-net-1.4.0.jar(org/apache/commons/net/ftp/FTPClient.class)
    [javac] class file has wrong version 48.0, should be 47.0
    [javac] Please remove or make sure it appears in the correct subdirectory 
of the classpath.
    [javac]             FTPClient ftp = new FTPClient();
 
 
I can't compile the file.
 
please advice on this
 
thanks
Fiji
 

                
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