Model comparison error (Error in model.frame.default(Terms, newdata, na.action = na.action

[TJ_Deng]

Hi developers:

I am running a model comparison node to compare two linear regression models. 

I get the following error:

Error: Model Comparison (72): Tool #3: Error in model.frame.default(Terms, newdata, na.action = na.action, xlev = object$xlevels) 

Anyone knows how to fix this?

Thanks!