Hi there!

I'm very new to r and trying to run a multi-level meta analysis using pre-calculated effect sizes. I've attached the datafile below.

The script I used as a first step to fit the model was:

res 2 : comparison (6) is possible only for atomic and list types

Could someone help give me a hand to help me understand what this error message means and where did I go wrong with the script?

Many thanks!