Also, Goto /usr/sap/SID/DVEMBGSXX/SDM/program/config and open sdmrepository.sdc file to see the values of SecStore.properties and SecStore.Key are pointing to correct path. You can verify this from configtool or config.properties in configtool folder.
If not then correct it and check the permission full path and file to secure store.
Regards,
Divyanshu