Cannot find imported issue key for external id

[Almu]

Hi everyone, 

I get an error when importing subtasks via csv in Jira SW Data Center (only 1 node).

My CSV file looks like 

issue type, parent id , issue id, subtask summary, subtask field1, subtask field2
subtask,94079, , test,value1,value2

Note. I get the parent id by exporting it previously the csv

I get this error

Unable to link issue from autoid-9004894541534873556 to 94079 with link named 'sub-task-link': Cannot find imported issue key for external id '94079'

BTW, the subtask is created BUT not associated with the parent!

Please, how can I solve this? Thanks

Almu