Oracle Message ORA-24418 - Cannot open further sessions.

ERRORCannot open further sessions.
CAUSESufficient number of sessions are not present in the pool to execute the call. No new sessions can be opened as the sessMax parameter supplied in OCISessionPoolCreate has been reached.
ACTIONCall OCISessionPoolCreate in OCI_SPOOL_REINITIALIZE mode and increase the value of the sessMax parameter.