Error in cs function of GAMLSS framework: variable lengths differ

General
1

The following is an official example of the use of the 'cs' function in GAMLSS framework(http://127.0.0.1:11212/library/gamlss/html/cs.html):

# cubic splines example
data(aids)
# fitting a smoothing cubic spline with 7 degrees of freedom
# plus the a quarterly  effect  
aids1<-gamlss(y~cs(x,df=7)+qrt,data=aids,family=PO) #

But it gives such an error message：

variable lengths differ (found for 'cs(aids$x, df = 7)')

Please help me. Thank you all

2

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