Could not find the main class: Grasp. Program will exit.

I am having trouble running jgrasp. I get the message above when I try to run jgrasp. I am running fedora if that makes a difference.

I have already set my environmental variable with this. Hopefully I did it right.

JGRASP_HOME=/opt/jgrasp
export JGRASP_HOME

https://www.linuxquestions.org/questions/linux-software-2/jgrasp-install-complexity-403393/\#post2054114

I have installed jdk. I am not sure what else do.