Apps DBA Workshop

There was a requirement to create one RAC database (11.2.0.1) running on Oracle Enterprise Linux 5.6. DBCA was running fine for creating database until selecting the location for datafiles. When i was selecting ASM as an storage then this process is aborting clusterware services and unmounting ASM Diskgroup. Expected is it should select the available disk group by default. But when i trying to browse the Disk group then its  aborting the clusterware services and unmounting the diskgroup from where we've executed dbca. Error log from clusterware: [client(7361)]CRS-1013:The OCR location in an ASM disk group is inaccessible. Details in /u01/11g_grid/grid/log/oelrac1/client/crsctl.log. 2012-10-09 12:03:00.730 [client(7400)]CRS-1013:The OCR location in an ASM disk group is inaccessible. Details in /u01/11g_grid/grid/log/oelrac1/client/crsctl.log. 2012-10-09 13:40:01.031 [client(11408)]CRS-1013:The OCR location in an ASM disk group is inaccessible. Details in /u01/11g_grid...