A couple of months ago another user ran into this error and I think it
is caused by multiple copies of GeoGebra being present on a PC. Did
you install one of these versions of GeoGebra just before the error
> The mathpiper had been working fine with the problematic plug-in, the
> GeoGebra. I remember I also noticed the plug-in GeoGebra is somewhat
> different than the current stable version V3.2.
The version of GeoGebra that is included in MathPiper is an older beta
version of GeoGebra 4.0.
> I had two other versions of GeoGebra installed in addition to the one
> with the MathPiper. They are V3.2 and V5.0 (External). They were
> working independently fine, I believe.
Do you remember if you installed another version of GeoGebra just
before the GeoGebra plugin in MathPiper broke?
Also, what operating system are you using?
> I could remove the other two versions of the GeoGebra in order to get
> the MathPiper and the Plug-In survived. What is your suggestion?
Unfortunately, this will probably not work. We had another user
encounter this same problem a month or two ago and uninstalling
GeoGebra did not fix it. I think I am going to have to set up a test
machine and try to reproduce this error on it.