In Process Builder, I've created a process that, when a new Account is created, creates a new Contact record, whose fields' values come from custom fields on my Account object. My process works as expected as far as creating the new Contact with the field values that I want. However, I would like the Contact to lookup to that Account. When I try to assign the following Contact field in the Process Builder

Account Id = [Account__c].Id

I get the following error when I try to create an Account and trigger my process.

Workflow Action Failed to Trigger Flow
The record couldn’t be saved because it failed to trigger a flow. 
A flow trigger failed to execute the flow with version ID 301j0000000TsHi. 
Contact your administrator for help. 

I assume this is because the Account hasn't actually been inserted yet and has no ID, but how do I get around this. It seems like a very common scenario to want to relate your newly created records to the "triggering" record.
Thanks in advance,
Lori