The man page says:
EINVAL A new segment was to be created and size < SHMMIN or size > SHMMAX, or no new segment was to be created, a segment with given key existed, but size is greater than the size of that segment.
This means that a memory segment still persists in the system. If your process is no longer running, run the ipcs command and remove the segment with ipcrm.
[root@myhost]# ipcs
------...
Thursday, March 1, 2018
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