VStar (Newest version) not loading (Windows 10 - 64 b)

American Association of Variable Star Observers (AAVSO)
Sun, 08/28/2022 - 18:35

Hello everybody,

I have installed VStar, the newest version, since it featured period and frecuency error calculations according to Foster 2010. After installation it ran very well, but I have been trying to launch it again and simply is not doing a thing.

Does anyone have the same problem? Can someone tell me how to solve this issue? I will appreciate very much.

Clear skies!


Astronomical Society of South Australia (ASSAU)
Load problem

Hi Enrique

Sorry for the delay in replying.

If you installed VStar via the Windows installer, could you run it in debug mode as described here and tell us what you see?



American Association of Variable Star Observers (AAVSO)
VStar in debug mode

Hello David,

Now forgive me for the late reply. I ran VStar from the Windows menu, on Debug Mode (from the VStar group), but no error showed up and I could use VStar normally. After that, I started VStar normally and there was no problem at all. What I think is that when VStar was not loading, the memory allocation error might be causing this malfunction as described in the github link you have shared with us, but I am not sure if this was the problem.

Thanks for the assistance, David!

Clear and dark skies!

American Association of Variable Star Observers (AAVSO)
Having similar problem

Under windows 11, latest update, vstar.exe disappears upon execution.  I ran the debug and get:  Suggestion on what to modify?

Launching java.exe
ith parameters:
-jar "C:\Users\jlawler\vstar\dist\vstar.jar"
Error occurred during initialization of VM
Could not reserve enough space for 1536000KB object heap

American Association of Variable Star Observers (AAVSO)
It looks like Java in your…

It looks like Java in your case is 32-bit. The best solution is to reinstall JRE with 64bit installer.

Currently, without reinstalling Java, you may try to remove memory allocation options that VStar.exe sends to Java.

See https://github.com/AAVSO/VStar/wiki/Installation-Recipes#troubleshooting-memory-problems