Importing a large ADIF: Now No QSOs Seen

[KG6NRV]

@Jordi, thank you for your kind reply.

I did not get the error before importing. In fact, I imported 2 smaller ADIF files from a POTA activation first without any issue. 
The Rumlog NG file had mapping warnings but did seem to import. After the import is when the E-Fail error began.

I will send you via email the RumLog ADIF as well as the Swisslog database. I really don't need any of the extra fields to be mapped; just the basics of the QSO.
And thank you so very much for this kind offer of assistance.

Please let me know why the Error might have occurred; is it incorrect to import an ADIF without doing the mapping?

73 de Bill Alpert/ KG6NRV