South Korea has said planned talks with North Korea have been scrapped because of a stalemate over who will lead each delegation.
North Korea said it was not sending its officials because of the disagreement, according to a spokesman for Seoul's Unification Ministry.
South Korea had wanted each country's top official for inter-Korean affairs to meet.
North Korea would not commit to that.
The two-day meeting had been set to start tomorrow in Seoul.
It would have been the first high-level meeting between the two Koreas in six years.
The meeting briefly raised hopes of an improvement in ties.
Recent relations have been marked with war threats.
The rivals were to discuss restarting two high-profile economic projects that were started during a past era of rapprochement.