Welcome!
I think we need more information, for example what package are you using in your analysis. What does your data look like? You migt find some useful hints in this FAQ.
A handy way to supply some sample data is the dput() function. In the case of a large dataset something like dput(head(mydata, 100)) should supply the data we need. Just do dput(mydata) where mydata is your data. Copy the output and paste it here.