Error in model.frame.default(Terms, newdata, na.action = na.action, xlev = object$xlevels) : variable lengths differ (found for 'REP') I keep getting this error and I am not sure how to fix it, the same code work for chlorophyll content

General
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rfB1 <-train(LAI~B11+REP+CIRE+B6+SR9, data=GGHNP_Data, method="rf",trControl= trControl)
rfB1

b11<- raster("C:/GGHNP/Band11.tif")
rep<-raster("C:/GGHNP/REP.tif")
cire<-raster("C:/GGHNP/CIRE.tif")
b6<-raster("C:/GGHNP/Band6.tif")
sr9<- raster("C:/GGHNP/SR9.tif")

s<- stack(b11,rep,cire,b6,sr9)
lai_gghnp<- predict(s, rfB1, na.action= na.pass)
plot(lai_gghnp, main = "LAI_GGHNP")

Error in model.frame.default(Terms, newdata, na.action = na.action, xlev = object$xlevels) :
variable lengths differ (found for 'REP')

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