And more:
https://wordpress.org/support/topic/wxr-file-error?replies=8
QUOTE from post posted one year ago:
Judging by the ratings and user reports, there are clearly some major issues in the WordPress export/import pipeline right now. What's even more distressing is how long it's been broken without getting any attention.
So please, if this plugin isn't working for you under standard use conditions, do everyone a favor and mark this plugin as "Not Working".
