Crossprod Error

[Maria Eduarda Guimaraes]

I was working on a multilevel sem, and it worked perfectly fine, but I've getting a message " Error in crossprod(OBS) : 'crossprod' is not a BUILTIN function", but I don't know what i'm doing wrong, since I have not changed a thing, except by updating R. Anyone has ever experienced this error?

[Yves Rosseel]

You will have to reinstall lavaan.

Because crossprod() and tcrossprod() became primitive functions in R
recently, any 'binary' package of lavaan (for example for windows) must
match the version of R that was used to compile lavaan (or any other
package for that matter).

Yves.