[Koha] Best practices for koha - journal migration using marcedit

Dear team, I would like to know how to covert excel data of journals especially with large number of issues(having more than 600 issues) for each journal. Tried using marcedit and it is giving error - 501 when trying to covert mrk to mrc format. Is there any other way how I can covert this data to mrc format. -- Regards T. Suresh Kumar