[R] About Error message

[pigpigmeow]

Hi again!
I have a question about R.
I have done gam in previous version of R with "mgcv" package and saved the
workspace. This workspace contains different models and I will do prediction
by these GAMs.

However, I install new version of R. and use the same workspace. when I type
summary(models), and the error message showed
Error in Predict.matrix.cr.smooth(object, dk$data) :  F is missing from cr
smooth - refit model with current mgcv.

this workspace is normal when I used previous version of R. What's wrong?!
Thank in advance.



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