Hi Chiragkumar,
thanks for using Toad for Apache Hadoop. Your problem could be most probably caused by using Kerberos encryption algorithm with larger key size than is shipped in Toad. Please check this tutorial how to fix this issue. Shortly: you need to download two files local_policy.jar and US_export_policy.jar and then overwrite with them original libraries located in installation folder of Toad. On Mac it should be located in path /Applications/Toad for Apache Hadoop/Contents/Eclipse/jre/lib/security
Please let us know, if this help.