<Task name>: Failed to expand email user <name> for this email task.
The Integration Service cannot expand a parameter or variable in the email user name.
Verify that the parameter or variable is defined properly in the parameter file and that its value in the parameter file matches the parameter or variable datatype. For example, you cannot set an integer workflow variable to a text string in the parameter file.
The Integration Service cannot expand the parameter or variable in the email user name due to an internal error.