unbalanced factorial anova in r

Question

I have the factorial IV called pa_res$Category_Recorded with size 121 and the continuous DV called Scaled_MO_sq$sq_score with size 123. I run the below code since the sample sizes are unequal but it still gives me a mistake:

Anova(lm(Scaled_MO_sq$sq_score~pa_res$Category_Recorded), type="III") Error in model.frame.default(formula = Scaled_MO_sq$sq_score ~ pa_res$Category_Recorded, : variable lengths differ (found for 'pa_res$Category_Recorded')

Could you please help me how to implement the regression for these two variables?!