The basic meaning of the "DC208002 CV <cv-number> NOT ACTIVE REPLY RETRY OR CANCEL" message is that an application tried to access the DC/UCF (IDMS) system, but the system is not active.
If you are receiving this message when attempting to either SIGNON to, or, to run a batch job against CA Dispatch it is because the CLIST or JCL you are executing contains references to the CA Dispatch "hlq...SYSCTL" file. Batch jobs and CLISTS that contain a reference to the SYSCTL file (via the "//CAICTL DD" and/or the "//SYSCTL DD" statements) are expecting the CA Dispatch started task to be ACTIVE either when you are attempting to logon or when the batch job runs.
A typical resolution for when this error is received would be to START CA Dispatch first. Then attempt another signon or rerun the failing batch job.
If you receive the message and have confirmed that the CA Dispatch started task actually IS active, then you should check the CLIST or JCL that you are executing and VERIFY that the name of the SYSCTL file being referenced matches the actual name of the SYSCTL file being pointed to by the active CA Dispatch STC.
If the Dispatch STC is active and you have verified that the name of the SYSCTL file is correct, then make sure you are attempting signon from the SAME SYSTEM that the CA Dispatch STC is active on. Or, in the case of a batch job failing with this error, the job is running in an initiator associated to the same system that the Dispatch STC is active on.