Peace talks due to be hosted by Norway between Marxist rebels and the Colombian government have been delayed due to neither side showing up.
Representatives of the Revolutionary Armed Forces of Colombia or FARC said a problem had arisen over the lifting of international arrest warrants preventing them from travelling.
Negotiators for Colombian President Juan Manuel Santos have also claimed logistical difficulties.
Santos is pushing for an end to the 48-year-long fight between state and rebels after recent success in cutting FARC numbers and eliminating some leaders.
Although he has refused to stop military operations against them until a deal is done, Santos wants an agreement before the 2014 presidential elections.
Norway, which has been a negotiator between the sides for years and is acting as a guarantor along with Cuba says both parties still plan to attend a press conference on Wednesday.