This has been asked a year ago but i couldn't find the answer anywhere:

Basically i can save one DXF, but once i try to save another i get the error message. I have to restart Solidworks and re-load the model every time. I've had this problem since 2017 r1 and i'm now on 2018 r1 and the problem remains. I tried repairing the install and it hasssn't fixed it either.

If anyone has any recommendations it would really help!

Thanks