Well... It means you file became corrupted most likely. Straight question - are you using legal Archicad version, or working on pirate? Sorry asking that, but in Russia most architects are using pirate versions. If you didn't pay 5000 dollars to Graphisoft for Archicad version - that means you are on pirate. If file is not working - this is a result of use of pirate version. If you are working on legal Archicad - contact Archicad distributors - from where you bought it - and ask for technical support. You will send your file them and they must look at this and find a solution how to fix it or extract information from it.
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Please only post in English as this is an English language forum
Barry - moderator
