Results 2 issues of Soomin Oh

Hello. I'm trying to plot the interaction of a plm output, but it keeps giving me the following error. I've tried uninstalling and reinstalling R and the packages therein, but...

enhancement

Hello. I'm trying to plot the interaction of a plm output, but it keeps giving me the following error. I've tried uninstalling and reinstalling R and the packages therein, but...

enhancement