Error 8024 is from the Teradata Database Gateway. It means that you have reached the session limit of the Teradata Database. By default, a Teradata Database supports 120 sessions per PE.
Here is the relevant excerpt from the Teradata Database Messages Reference:
8024 All virtual circuits are currently in use.
Explanation: This error is sent in response to an assign request when a either the gateway capacity or the capacity of all PEs configured with the same logical host id has been reached.
Generated By: Gateway
For Whom: End User
Remedy: Wait some amount of time and retry the assign request. The assign will succeed when another session logs off.
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