Your log file says:
2016-03-15T16:16:02.000+05:30] [OBIPS] [ERROR:31]  [saw.connectionPool.getConnection] [ecid: ] [tid: ] Error connecting to the Oracle BI Server: Could not connect to the Oracle BI Server because it is not running or is inaccessible. Please contact your system administrator.
Odbc driver returned an error (SQLDriverConnectW).
State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred.
[nQSError: 12002] Socket communication error at call=send: (Number=111) Connection refused
[nQSError: 12008] Unable to connect to port 9706 on machine ssi-biw03.idc.oracle.com.
which seems BI Server is not able to Connect to Database. ping Database server from BI server if db is on different server, and also check db is up and running.