Notification service activity always suspends when using an expression as email

Summary

Notification service activity always suspends when using an expression as email

Content

I have a business object as follows:

 

Claim (type:Object)

    - claimNumber (type:string)

    - customer (type:customer)

 

Object: Customer

      - Name (type:string)

      - Email (type:string)

 

 

I have a start form event that I auto associate with my claim object.  On there I have elements for Claim.claimNumber, Claim.customer.name, Claim.customer.email.    The output is put in a data object called claimFormDataObject.  Next in sequence is an email notification service activity.  In the to: field I have a simple expression: claimFormDataObject.claimObject.customer.name.  However the process suspends with this error: (retreived from the processes tab)