Help running this fixed effects regression – data set is attached #Running a Fix

Help running this fixed effects regression – data set is attached
#Running a Fixed Effects — loading Data File
trd = read.csv(“tzndata.csv”,header=TRUE)
simplereg=lm(gdp ~ loan, data=trd)
summary(simplereg)
#Dummy Variable
dummyvar = lm(gdp ~ loan, data=trd,)
summary(dummyvar)
#Within Estimator
within = plm(gdp ~ loan, index=”region”,”year”, model=”within”, data=trd)
summary(within)
#With Control Variables
controlvariable = plm(gdp ~ loan + controlvariable, index=c(“region”,”year”), model = “within”)
summary(controlvariable)