[R] choosing a proper knot in GAM mgcv package

[arunkumar1111]

hi
I want to choose proper knot for the following formula

formula = y~ s(x1) + s(x2) + s(x3) + s(x4) + s(x5) + s(x6) +s(x7) + s(x8) 

gam(fromula,data=dat)

if i run the error is
Error in smooth.construct.tp.smooth.spec(object, dk$data, dk$knots) : 
  A term has fewer unique covariate combinations than specified maximum
degrees of freedom

how to find  k and rectify this error


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Thanks in Advance
        Arun
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