ORA-12516, TNS:listener could not find available handler with matching protocol stack

 I am getting the following error in Oracle  11.2.0.3 RAC environment. and this issue is occurring when i increase the connection pool size in weblogic server.  Please advice.

Process:  1000

session : 1552

 

ORA-12516, TNS:listener could not find available handler with matching protocol stack 

Complete error:

 

<Jan 16, 2013 7:07:22 AM IST> <Warning> <JDBC> <BEA-001129> <Received exception while creating connection for pool "osm_pool_rac2_group_b": Listener refused the connect

ion with the following error:

ORA-12516, TNS:listener could not find available handler with matching protocol stack

> 

<Jan 16, 2013 7:07:23 AM IST> <Warning> <JDBC> <BEA-001129> <Received exception while creating connection for pool "osm_pool_rac2_group_b": Listener refused the connect