Errors running houdini on worker: ERROR: Encountered the following error while initializing the Plugin Sandbox: 'Value cannot be null. (Parameter 'input')'

I’m in exactly the same boat with latest versions of Deadline 10.1.21.4 and Houdini 19.0.624. Deadline and PDG only work with an on demand instance. The exact same AMI, security group, and what I believe is the appropriate role permissions required for spot instances don’t work with the spot plugin. I created a new thread here:

@Guilherme did you get this resolved in the end?