
Hi so I'm trying to do limma fitting on my data but i keep getting the following error  
Error in rowMeans(y$exprs, na.rm=TRUE):'x' must be numeric
But I'm not sure what the problem is does anyone have suggestions?

Here's what i've been doing after normalization:
data<-subset(data_pheno, select=is.na(data_pheno['case',])==FALSE) #remove columns with NA
group <- factor(data['case',]) 
design <- model.matrix(~0+group) #dim 240  2
expr<-as.data.frame(data[1:39693,]) #only keep rows that need to fit aka expression data, dim 39693 240

fit <- lmFit(expr,design) 
Error in rowMeans(y$exprs, na.rm=TRUE):'x' must be numeric


Thanks,
.kripa 		 	   		  
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