You can identify the type of error when the VRA is not available by checking the PSW and the registers at the time of the error as follows:

• If the PSW equals register 15, it probably indicates that the subsystem function routine address in the SSVT is not valid.
• If the PSW contains a valid address in a module other than IEFJSRE1 or IEFJRASP, it is probably a subsystem function routine error. The error occurred in this routine.
• If the PSW contains a valid address in IEFJSRE1 or IEFJRASP, the error occurred while referencing subsystem related control blocks, the input parameter list, or in the SSI. Examine the SSCVT chain pointed to by the JESSSCT field for pointers that are not valid. The SSIDATA IPCS subcommand displays the subsystems defined to the SSI based on this chain, and may help identify a problem. See z/OS MVS IPCS Commands or z/OS MVS Diagnosis: Reference for more information.