Unable to install Oracle 11G in solaris 10

Hi
I am unalbe to install oracle 11G in solaris 10 in SPARC machine, I am getting this below errror while installing with /.runInstaller

Warning: Cannot convert string "-monotype-arial-regular-r-normal--*-140-*-*-p-*-iso8859-1" to type FontStruct
Exception java.lang.NullPointerException occurred..
java.lang.NullPointerException
at oracle.sysman.oii.oiix.OiixPathOps.concatPath(OiixPathOps.java:566)
at oracle.sysman.oii.oiic.OiicBaseApp.setAdditionalProperties(OiicBaseApp.java:571)
at oracle.sysman.oii.oiic.OiicInstaller.processCommandLine(OiicInstaller.java:683)
at oracle.sysman.oii.oiic.OiicInstaller.runInstaller(OiicInstaller.java:907)
at oracle.sysman.oio.oioc.OiocOneClickInstaller.runInstaller(OiocOneClickInstaller.java:1214)
at oracle.sysman.oio.oioc.OiocOneClickInstaller.startRun(OiocOneClickInstaller.java:1304)
at oracle.sysman.oio.oioc.OiocOneClickDB.nextClicked(OiocOneClickDB.java:1780)
at oracle.sysman.oio.oioc.OiocOneClickInstaller.main(OiocOneClickInstaller.java:1551)

Pls guide me how to resolve this problem.......

Thanks in Advance
Durga