Hello everyone!!
I have this error:
(http://gohproject.free.fr/ErrorNeko2.png)
(http://gohproject.free.fr/ErrorNeko.png)
It means that the version of Ruby he's implemented has only been partially implemented or not enabled in the current build of his RPGXP Player. It's not something we can fix, you'll have to contact the author of the app or ask him to make it open source so somebody else can fix it.