The error "Error: 'name' argument cannot be null. Parameter name: name.'" occurs when trying to use a Data Connector rule that includes a foreign key.
A product defect has been raised for this issue and will be resolved in a future release. Until then, apply the solution found in the following related article:
Error "Row x skipped for data class '<data class name>'. Data class foreign key lookup on column '<column name>' failed." occurs when using a Data Connector import rule that has a foreign key data class mapping