Error "comparison (6) is possible only for atomic and list types" encountered in metafor

I'm very new to r and trying to run a multi-level meta analysis using pre-calculated effect sizes. The data file can be accessed via this link:testrunfile

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

res - rma.mv (yi = es_r, v = var, data = testrun, method = REML, level = 95, digits = 7, slab = ref, random = ~ 1 | samp_id)

But I keep getting this error:

Error in verbose 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!