oswbba then error Exception in thread "main" java.lang.NullPointerException

hello gurus,

    I got a problem on NFS disk then I have this next error :

"

Parsing file sbwhu01_ps_17.03.23.1000.dat ...

An exception occured in insertVmstatLists on line 2

An exception occured in processTopData on line 2448

Exception in thread "main" java.lang.NullPointerException

        at o.b(Unknown Source)

        at B.a(Unknown Source)

        at o.a(Unknown Source)

        at OSWGraph.OSWGraph.main(Unknown Source)

"

1 - I executed ./startOSWbb.sh 60 5 gzip /oraexport/logWatch

I use the version 7.3.4 for Linux 6.8 x86_64.

2 - afterwards I executed "java -jar oswbba.jar -i /oraexport/logWatch/"

then I got the error above.

I do not know how may I resolve the problem ?