Dex not supported

[rajeshnadiminti]

When I trying to run qark against the apk, it's giving the following error:
com.googlecode.d2j.DexException: not support version.
at com.googlecode.d2j.reader.DexFileReader.(DexFileReader.java:151)
at com.googlecode.d2j.reader.DexFileReader.(DexFileReader.java:211)
at com.googlecode.dex2jar.tools.Dex2jarCmd.doCommandLine(Dex2jarCmd.java:104)
at com.googlecode.dex2jar.tools.BaseCmd.doMain(BaseCmd.java:288)
at com.googlecode.dex2jar.tools.Dex2jarCmd.main(Dex2jarCmd.java:32)