Hi, I just saved a DXF file with AutoCAD and when I opened it later it turned out like what this screen capture shows below. There are nothing but a command says "Press ENTER to continue".

But whatever I press ENTER/ESC/SPACE the window will automatically shut off.

I tried to open other DXF files and they all work well. I also opened this DXF with Adobe Illustrator CC and it works! I then exported another DXF with Ai and opened in CAD it can be opened but I lost all my layers!

I spent the whole afternoon drawing this! I'm sure I saved it well before I closed it. I also saved it frequently as I drew. The file size is 2.9MB which seems quite normal. 

Please please help and this is really urgent...I don't want to redo it again and waste time

Thanks a lot!