Import .xlsx to oracle sql developer error -

I am exporting .xlsx file to 1,000 megawatt rows to SQL developers using the 'Data Import' function. However, I get an error:

'import data ...' (id = 998) during the handleEvent during operation. None of the attached administrators handled - oracle.ide.controller.IdeAction$ControllerDelegatingController@6eb6ea5e [oracle.dbt ools.raptor.controls.sqldialog.ObjectACtionController]

Any help Can do? Thanks!

Try using .xls file instead of .xls file. It should work fine.