Oracle Message ORA-24401 - cannot open further connections

ERRORcannot open further connections
CAUSESufficient number of connections are not present in the pool to execute the call. No new connections can be opened as the connMax parameter supplied in OCIConnectionPoolCreate has been reached.
ACTIONCall OCIConnectionPoolCreate in OCI_CPOOL_REINITIALIZE mode and increase the value of the connMax parameter.