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Karen PannunzioKaren Pannunzio 

Process builder error - a flow trigger failed to execute

I am creating an opportunity from a campaign member record using the Process Builder.  I would like the sales rep to be the Opportunity Owner.
The sales rep is the Account Owner.  The Account Owner is a lookup to an external id.  Is this what is causing the error?  It is not creating the opportunity.  The Create a Record (opportunity) is setting field value of Owner ID (type Reference) to an External Id.