I faced an issue of skewness with my continuous variables ... Are you talking about skewness of the target (or response) variable? Or skewness of the predictor variables?   ... for which I firstly transformed into log but it didn't work What didn't work? What did you see that makes you think it didn't work? What variable(s) did you transform?   but I got validation average square error as 116 so I am confused how to interpret such huge error Did you transform the target variable? You really haven't said if you did or did not.   What makes you think that a 116 is "huge"? What are typical values of sales? Maybe the interpretation is that the model didn't fit well; or maybe the interpretation is that you have very large values of sales and a 116 is reasonable. We need a lot more information and context here. ... View more