Error in conjoint analysis

Hello everyone, I'm trying to do the conjoint analysis.
This is my script:

library(conjoint)
preferences=read.csv(file.choose())
profiles=read.csv(file.choose())
levels=read.csv(file.choose())
print(preferences)
print (profiles)
print (levels)
Conjoint(y=preferences,x=profiles,z=levels)
Error in lm.fit(x, y, offset = offset, singular.ok = singular.ok, ...) :
NA/NaN/Inf in 'y'
In addition: Warning message:
In storage.mode(v) <- "double" : NA introduced by coercion

What I have to do?

Hello.
Thanks for providing code , but you could take further steps to make it more convenient for other forum users to help you.

Share some representative data that will enable your code to run and show the problematic behaviour.

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