Residual Plots

HI All,
I Am creating a residual plot for my linear model. 
the code I created is : plot(eval$bty_avg,residuals,ylab="residuals",
xlab="Score", main = "Residual Analysis")Here data set is eval. eval$bty_avg
is my  response variable and residual is the var I have created using resid
function to store the residuals. 
syntax used is : residuals<- resid(m_bty)

However when I run the syntax I receive the following error message:-
Error in eval$bty_avg : object of type 'closure' is not subsettable

Please suggest. 



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