SONAR X1-Exporting Error

I have some projects Im trying to Export.

Yesterday I exported about 22 projects without a problem.

The computer sat all night and I started again today.

We tracked 4 more songs and tried to export and got the following error 

"An Internal Error occured while processing mixdown.  The operation was unsuccessful."


I tried all of the 4 new projects-same error

I reloaded some from yesterday that had no problems-same error when trying to export those.

The problem/error just started for no apparent/obvious reason. 

I havent changed anything in my process as far as recording or exporting.

The project is 
48/24
being exported as

44100/16
wave
Entire Mix
Stereo
Triangular
No Preset

We didnt have any storms or power surges last night

After finding this error,
I did try restarting the computer,
Complete power off of computer and everything connected including interface,  left power off for a few minutes and brought it back up,

Problem still here,  cant export-above listed error in consistently popping up at export

Any ideas?

I believe machine specs are in my signature

Thanks