Invalid group code

Hi all,

When trying to load a saved DWG that I have been working on only a few hours ago, I get An error occurred while loading the drawing? so a few times now gone back to an earlier DWG version and redo all I have done so so well I hope you can help me on this one, also it says try recovery but no clue on how to do that tried loading back up file but no good.

Many thanks all.

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