I set read/write permissions on /etc/workflow/instance but still WorkflowSession.startWorkflow() is throwing WorkflowException: Cannot create workflow instance.
The same is working in AEM 6.3 but throwing exception in AEM 6.4
It is against NDA to post AEM 6.4 beta questions on the main forums. You should be asking these in the Beta forums (Adobe prerelease) set for it. Request you to please use beta forums.
kautuksahni Can you please help me with the link of the beta forum?
Its there in the pre-released site from where you downloaded the AEM. If you got this JAR from someone then please ask them to create the question on your behalf.