LTpowerCAD not working today

[Flyback]

Hi,
I have been using LTpowerCAD in the last few weeks.
However, today it wont work.
It gives the following error message. (attached)
I am just trying to do a Buck using LT3680 for 12vin and 5vout at 2A out
Fsw = 335khz.

Do you know what is the problem?
I never got this error message before

There is no excel file open.

 

[eTech]

Hi,
I have been using LTpowerCAD in the last few weeks.
However, today it wont work.
It gives the following error message. (attached)
I am just trying to do a Buck using LT3680 for 12vin and 5vout at 2A out
Fsw = 335khz.

Do you know what is the problem?
I never got this error message before

There is no excel file open.

I think its telling you an Excel instance instance is open(?)
If your using windows, launch task manager and kill the excel instance.